1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #if 0 33 #ifndef lint 34 static char copyright[] = 35 "@(#) Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994\n\ 36 The Regents of the University of California. All rights reserved.\n"; 37 #endif /* not lint */ 38 #endif 39 40 #ifndef lint 41 #if 0 42 static char sccsid[] = "@(#)ftpd.c 8.4 (Berkeley) 4/16/94"; 43 #endif 44 #endif /* not lint */ 45 46 #include <sys/cdefs.h> 47 /* 48 * FTP server. 49 */ 50 #include <sys/param.h> 51 #include <sys/ioctl.h> 52 #include <sys/mman.h> 53 #include <sys/socket.h> 54 #include <sys/stat.h> 55 #include <sys/time.h> 56 #include <sys/wait.h> 57 58 #include <netinet/in.h> 59 #include <netinet/in_systm.h> 60 #include <netinet/ip.h> 61 #include <netinet/tcp.h> 62 63 #define FTP_NAMES 64 #include <arpa/ftp.h> 65 #include <arpa/inet.h> 66 #include <arpa/telnet.h> 67 68 #include <ctype.h> 69 #include <dirent.h> 70 #include <err.h> 71 #include <errno.h> 72 #include <fcntl.h> 73 #include <glob.h> 74 #include <limits.h> 75 #include <netdb.h> 76 #include <pwd.h> 77 #include <grp.h> 78 #ifdef HAVE_LIBOPIE 79 #include <opie.h> 80 #endif 81 #include <signal.h> 82 #include <stdint.h> 83 #include <stdio.h> 84 #include <stdlib.h> 85 #include <string.h> 86 #include <syslog.h> 87 #include <time.h> 88 #include <unistd.h> 89 #include <libutil.h> 90 #ifdef LOGIN_CAP 91 #include <login_cap.h> 92 #endif 93 94 #ifdef USE_PAM 95 #include <security/pam_appl.h> 96 #endif 97 98 #ifdef __HAIKU__ 99 #include <shadow.h> 100 #endif 101 102 #include "pathnames.h" 103 #include "extern.h" 104 105 #include <stdarg.h> 106 107 static char version[] = "Version 6.00LS"; 108 #undef main 109 110 union sockunion ctrl_addr; 111 union sockunion data_source; 112 union sockunion data_dest; 113 union sockunion his_addr; 114 union sockunion pasv_addr; 115 116 int daemon_mode; 117 int data; 118 int dataport; 119 int hostinfo = 1; /* print host-specific info in messages */ 120 int logged_in; 121 struct passwd *pw; 122 char *homedir; 123 int ftpdebug; 124 int timeout = 900; /* timeout after 15 minutes of inactivity */ 125 int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ 126 int logging; 127 int restricted_data_ports = 1; 128 int paranoid = 1; /* be extra careful about security */ 129 int anon_only = 0; /* Only anonymous ftp allowed */ 130 int assumeutf8 = 0; /* Assume that server file names are in UTF-8 */ 131 int guest; 132 int dochroot; 133 char *chrootdir; 134 int dowtmp = 1; 135 int stats; 136 int statfd = -1; 137 int type; 138 int form; 139 int stru; /* avoid C keyword */ 140 int mode; 141 int usedefault = 1; /* for data transfers */ 142 int pdata = -1; /* for passive mode */ 143 int readonly = 0; /* Server is in readonly mode. */ 144 int noepsv = 0; /* EPSV command is disabled. */ 145 int noretr = 0; /* RETR command is disabled. */ 146 int noguestretr = 0; /* RETR command is disabled for anon users. */ 147 int noguestmkd = 0; /* MKD command is disabled for anon users. */ 148 int noguestmod = 1; /* anon users may not modify existing files. */ 149 int use_blacklist = 0; 150 151 off_t file_size; 152 off_t byte_count; 153 #if !defined(CMASK) || CMASK == 0 154 #undef CMASK 155 #define CMASK 027 156 #endif 157 int defumask = CMASK; /* default umask value */ 158 char tmpline[7]; 159 char *hostname; 160 int epsvall = 0; 161 162 #ifdef VIRTUAL_HOSTING 163 char *ftpuser; 164 165 static struct ftphost { 166 struct ftphost *next; 167 struct addrinfo *hostinfo; 168 char *hostname; 169 char *anonuser; 170 char *statfile; 171 char *welcome; 172 char *loginmsg; 173 } *thishost, *firsthost; 174 175 #endif 176 char remotehost[NI_MAXHOST]; 177 char *ident = NULL; 178 179 static char wtmpid[20]; 180 181 #ifdef USE_PAM 182 static int auth_pam(struct passwd**, const char*); 183 pam_handle_t *pamh = NULL; 184 #endif 185 186 #ifdef HAVE_LIBOPIE 187 static struct opie opiedata; 188 static char opieprompt[OPIE_CHALLENGE_MAX+1]; 189 #endif 190 static int pwok; 191 192 char *pid_file = NULL; /* means default location to pidfile(3) */ 193 194 /* 195 * Limit number of pathnames that glob can return. 196 * A limit of 0 indicates the number of pathnames is unlimited. 197 */ 198 #define MAXGLOBARGS 16384 199 # 200 201 /* 202 * Timeout intervals for retrying connections 203 * to hosts that don't accept PORT cmds. This 204 * is a kludge, but given the problems with TCP... 205 */ 206 #define SWAITMAX 90 /* wait at most 90 seconds */ 207 #define SWAITINT 5 /* interval between retries */ 208 209 int swaitmax = SWAITMAX; 210 int swaitint = SWAITINT; 211 212 #ifdef SETPROCTITLE 213 char proctitle[LINE_MAX]; /* initial part of title */ 214 #endif /* SETPROCTITLE */ 215 216 #define LOGCMD(cmd, file) logcmd((cmd), (file), NULL, -1) 217 #define LOGCMD2(cmd, file1, file2) logcmd((cmd), (file1), (file2), -1) 218 #define LOGBYTES(cmd, file, cnt) logcmd((cmd), (file), NULL, (cnt)) 219 220 static volatile sig_atomic_t recvurg; 221 static int transflag; /* NB: for debugging only */ 222 223 #define STARTXFER flagxfer(1) 224 #define ENDXFER flagxfer(0) 225 226 #define START_UNSAFE maskurg(1) 227 #define END_UNSAFE maskurg(0) 228 229 /* It's OK to put an `else' clause after this macro. */ 230 #define CHECKOOB(action) \ 231 if (recvurg) { \ 232 recvurg = 0; \ 233 if (myoob()) { \ 234 ENDXFER; \ 235 action; \ 236 } \ 237 } 238 239 #ifdef VIRTUAL_HOSTING 240 static void inithosts(int); 241 static void selecthost(union sockunion *); 242 #endif 243 static void ack(char *); 244 static void sigurg(int); 245 static void maskurg(int); 246 static void flagxfer(int); 247 static int myoob(void); 248 static int checkuser(char *, char *, int, char **, int *); 249 static FILE *dataconn(char *, off_t, char *); 250 static void dolog(struct sockaddr *); 251 static void end_login(void); 252 static FILE *getdatasock(char *); 253 static int guniquefd(char *, char **); 254 static void lostconn(int); 255 static void sigquit(int); 256 static int receive_data(FILE *, FILE *); 257 static int send_data(FILE *, FILE *, size_t, off_t, int); 258 static struct passwd * 259 sgetpwnam(char *); 260 static char *sgetsave(char *); 261 static void reapchild(int); 262 static void appendf(char **, char *, ...) __printflike(2, 3); 263 static void logcmd(char *, char *, char *, off_t); 264 static void logxfer(char *, off_t, time_t); 265 static char *doublequote(char *); 266 static int *socksetup(int, char *, const char *); 267 268 int 269 main(int argc, char *argv[], char **envp) 270 { 271 socklen_t addrlen; 272 int ch, on = 1, tos, s = STDIN_FILENO; 273 char *cp, line[LINE_MAX]; 274 FILE *fd; 275 char *bindname = NULL; 276 const char *bindport = "ftp"; 277 int family = AF_UNSPEC; 278 struct sigaction sa; 279 280 tzset(); /* in case no timezone database in ~ftp */ 281 sigemptyset(&sa.sa_mask); 282 sa.sa_flags = SA_RESTART; 283 284 /* 285 * Prevent diagnostic messages from appearing on stderr. 286 * We run as a daemon or from inetd; in both cases, there's 287 * more reason in logging to syslog. 288 */ 289 (void) freopen(_PATH_DEVNULL, "w", stderr); 290 opterr = 0; 291 292 /* 293 * LOG_NDELAY sets up the logging connection immediately, 294 * necessary for anonymous ftp's that chroot and can't do it later. 295 */ 296 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 297 298 while ((ch = getopt(argc, argv, 299 "468a:ABdDEhlmMoOp:P:rRSt:T:u:UvW")) != -1) { 300 switch (ch) { 301 case '4': 302 family = (family == AF_INET6) ? AF_UNSPEC : AF_INET; 303 break; 304 305 case '6': 306 family = (family == AF_INET) ? AF_UNSPEC : AF_INET6; 307 break; 308 309 case '8': 310 assumeutf8 = 1; 311 break; 312 313 case 'a': 314 bindname = optarg; 315 break; 316 317 case 'A': 318 anon_only = 1; 319 break; 320 321 case 'B': 322 #ifdef USE_BLACKLIST 323 use_blacklist = 1; 324 #else 325 syslog(LOG_WARNING, "not compiled with USE_BLACKLIST support"); 326 #endif 327 break; 328 329 case 'd': 330 ftpdebug++; 331 break; 332 333 case 'D': 334 daemon_mode++; 335 break; 336 337 case 'E': 338 noepsv = 1; 339 break; 340 341 case 'h': 342 hostinfo = 0; 343 break; 344 345 case 'l': 346 logging++; /* > 1 == extra logging */ 347 break; 348 349 case 'm': 350 noguestmod = 0; 351 break; 352 353 case 'M': 354 noguestmkd = 1; 355 break; 356 357 case 'o': 358 noretr = 1; 359 break; 360 361 case 'O': 362 noguestretr = 1; 363 break; 364 365 case 'p': 366 pid_file = optarg; 367 break; 368 369 case 'P': 370 bindport = optarg; 371 break; 372 373 case 'r': 374 readonly = 1; 375 break; 376 377 case 'R': 378 paranoid = 0; 379 break; 380 381 case 'S': 382 stats++; 383 break; 384 385 case 't': 386 timeout = atoi(optarg); 387 if (maxtimeout < timeout) 388 maxtimeout = timeout; 389 break; 390 391 case 'T': 392 maxtimeout = atoi(optarg); 393 if (timeout > maxtimeout) 394 timeout = maxtimeout; 395 break; 396 397 case 'u': 398 { 399 long val = 0; 400 401 val = strtol(optarg, &optarg, 8); 402 if (*optarg != '\0' || val < 0) 403 syslog(LOG_WARNING, "bad value for -u"); 404 else 405 defumask = val; 406 break; 407 } 408 case 'U': 409 restricted_data_ports = 0; 410 break; 411 412 case 'v': 413 ftpdebug++; 414 break; 415 416 case 'W': 417 dowtmp = 0; 418 break; 419 420 default: 421 syslog(LOG_WARNING, "unknown flag -%c ignored", optopt); 422 break; 423 } 424 } 425 426 /* handle filesize limit gracefully */ 427 sa.sa_handler = SIG_IGN; 428 (void)sigaction(SIGXFSZ, &sa, NULL); 429 430 if (daemon_mode) { 431 int *ctl_sock, fd, maxfd = -1, nfds, i; 432 fd_set defreadfds, readfds; 433 pid_t pid; 434 struct pidfh *pfh; 435 436 if ((pfh = pidfile_open(pid_file, 0600, &pid)) == NULL) { 437 if (errno == EEXIST) { 438 syslog(LOG_ERR, "%s already running, pid %d", 439 getprogname(), (int)pid); 440 exit(1); 441 } 442 syslog(LOG_WARNING, "pidfile_open: %m"); 443 } 444 445 /* 446 * Detach from parent. 447 */ 448 if (daemon(1, 1) < 0) { 449 syslog(LOG_ERR, "failed to become a daemon"); 450 exit(1); 451 } 452 453 if (pfh != NULL && pidfile_write(pfh) == -1) 454 syslog(LOG_WARNING, "pidfile_write: %m"); 455 456 sa.sa_handler = reapchild; 457 (void)sigaction(SIGCHLD, &sa, NULL); 458 459 #ifdef VIRTUAL_HOSTING 460 inithosts(family); 461 #endif 462 463 /* 464 * Open a socket, bind it to the FTP port, and start 465 * listening. 466 */ 467 ctl_sock = socksetup(family, bindname, bindport); 468 if (ctl_sock == NULL) 469 exit(1); 470 471 FD_ZERO(&defreadfds); 472 for (i = 1; i <= *ctl_sock; i++) { 473 FD_SET(ctl_sock[i], &defreadfds); 474 if (listen(ctl_sock[i], 32) < 0) { 475 syslog(LOG_ERR, "control listen: %m"); 476 exit(1); 477 } 478 if (maxfd < ctl_sock[i]) 479 maxfd = ctl_sock[i]; 480 } 481 482 /* 483 * Loop forever accepting connection requests and forking off 484 * children to handle them. 485 */ 486 while (1) { 487 FD_COPY(&defreadfds, &readfds); 488 nfds = select(maxfd + 1, &readfds, NULL, NULL, 0); 489 if (nfds <= 0) { 490 if (nfds < 0 && errno != EINTR) 491 syslog(LOG_WARNING, "select: %m"); 492 continue; 493 } 494 495 pid = -1; 496 for (i = 1; i <= *ctl_sock; i++) 497 if (FD_ISSET(ctl_sock[i], &readfds)) { 498 addrlen = sizeof(his_addr); 499 fd = accept(ctl_sock[i], 500 (struct sockaddr *)&his_addr, 501 &addrlen); 502 if (fd == -1) { 503 syslog(LOG_WARNING, 504 "accept: %m"); 505 continue; 506 } 507 switch (pid = fork()) { 508 case 0: 509 /* child */ 510 (void) dup2(fd, s); 511 (void) dup2(fd, STDOUT_FILENO); 512 (void) close(fd); 513 for (i = 1; i <= *ctl_sock; i++) 514 close(ctl_sock[i]); 515 if (pfh != NULL) 516 pidfile_close(pfh); 517 goto gotchild; 518 case -1: 519 syslog(LOG_WARNING, "fork: %m"); 520 /* FALLTHROUGH */ 521 default: 522 close(fd); 523 } 524 } 525 } 526 } else { 527 addrlen = sizeof(his_addr); 528 if (getpeername(s, (struct sockaddr *)&his_addr, &addrlen) < 0) { 529 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 530 exit(1); 531 } 532 533 #ifdef VIRTUAL_HOSTING 534 if (his_addr.su_family == AF_INET6 && 535 IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr)) 536 family = AF_INET; 537 else 538 family = his_addr.su_family; 539 inithosts(family); 540 #endif 541 } 542 543 gotchild: 544 sa.sa_handler = SIG_DFL; 545 (void)sigaction(SIGCHLD, &sa, NULL); 546 547 sa.sa_handler = sigurg; 548 sa.sa_flags = 0; /* don't restart syscalls for SIGURG */ 549 (void)sigaction(SIGURG, &sa, NULL); 550 551 sigfillset(&sa.sa_mask); /* block all signals in handler */ 552 sa.sa_flags = SA_RESTART; 553 sa.sa_handler = sigquit; 554 (void)sigaction(SIGHUP, &sa, NULL); 555 (void)sigaction(SIGINT, &sa, NULL); 556 (void)sigaction(SIGQUIT, &sa, NULL); 557 (void)sigaction(SIGTERM, &sa, NULL); 558 559 sa.sa_handler = lostconn; 560 (void)sigaction(SIGPIPE, &sa, NULL); 561 562 addrlen = sizeof(ctrl_addr); 563 if (getsockname(s, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 564 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 565 exit(1); 566 } 567 dataport = ntohs(ctrl_addr.su_port) - 1; /* as per RFC 959 */ 568 #ifdef VIRTUAL_HOSTING 569 /* select our identity from virtual host table */ 570 selecthost(&ctrl_addr); 571 #endif 572 #ifdef IP_TOS 573 if (ctrl_addr.su_family == AF_INET) 574 { 575 tos = IPTOS_LOWDELAY; 576 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 577 syslog(LOG_WARNING, "control setsockopt (IP_TOS): %m"); 578 } 579 #endif 580 /* 581 * Disable Nagle on the control channel so that we don't have to wait 582 * for peer's ACK before issuing our next reply. 583 */ 584 if (setsockopt(s, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0) 585 syslog(LOG_WARNING, "control setsockopt (TCP_NODELAY): %m"); 586 587 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 588 589 (void)snprintf(wtmpid, sizeof(wtmpid), "%xftpd", getpid()); 590 591 /* Try to handle urgent data inline */ 592 #ifdef SO_OOBINLINE 593 if (setsockopt(s, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0) 594 syslog(LOG_WARNING, "control setsockopt (SO_OOBINLINE): %m"); 595 #endif 596 597 #ifdef F_SETOWN 598 if (fcntl(s, F_SETOWN, getpid()) == -1) 599 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 600 #endif 601 dolog((struct sockaddr *)&his_addr); 602 /* 603 * Set up default state 604 */ 605 data = -1; 606 type = TYPE_A; 607 form = FORM_N; 608 stru = STRU_F; 609 mode = MODE_S; 610 tmpline[0] = '\0'; 611 612 /* If logins are disabled, print out the message. */ 613 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { 614 while (fgets(line, sizeof(line), fd) != NULL) { 615 if ((cp = strchr(line, '\n')) != NULL) 616 *cp = '\0'; 617 lreply(530, "%s", line); 618 } 619 (void) fflush(stdout); 620 (void) fclose(fd); 621 reply(530, "System not available."); 622 exit(0); 623 } 624 #ifdef VIRTUAL_HOSTING 625 fd = fopen(thishost->welcome, "r"); 626 #else 627 fd = fopen(_PATH_FTPWELCOME, "r"); 628 #endif 629 if (fd != NULL) { 630 while (fgets(line, sizeof(line), fd) != NULL) { 631 if ((cp = strchr(line, '\n')) != NULL) 632 *cp = '\0'; 633 lreply(220, "%s", line); 634 } 635 (void) fflush(stdout); 636 (void) fclose(fd); 637 /* reply(220,) must follow */ 638 } 639 #ifndef VIRTUAL_HOSTING 640 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 641 fatalerror("Ran out of memory."); 642 if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0) 643 hostname[0] = '\0'; 644 hostname[MAXHOSTNAMELEN - 1] = '\0'; 645 #endif 646 if (hostinfo) 647 reply(220, "%s FTP server (%s) ready.", hostname, version); 648 else 649 reply(220, "FTP server ready."); 650 for (;;) 651 (void) yyparse(); 652 /* NOTREACHED */ 653 } 654 655 static void 656 lostconn(int signo) 657 { 658 659 if (ftpdebug) 660 syslog(LOG_DEBUG, "lost connection"); 661 dologout(1); 662 } 663 664 static void 665 sigquit(int signo) 666 { 667 668 syslog(LOG_ERR, "got signal %d", signo); 669 dologout(1); 670 } 671 672 #ifdef VIRTUAL_HOSTING 673 /* 674 * read in virtual host tables (if they exist) 675 */ 676 677 static void 678 inithosts(int family) 679 { 680 int insert; 681 size_t len; 682 FILE *fp; 683 char *cp, *mp, *line; 684 char *hostname; 685 char *vhost, *anonuser, *statfile, *welcome, *loginmsg; 686 struct ftphost *hrp, *lhrp; 687 struct addrinfo hints, *res, *ai; 688 689 /* 690 * Fill in the default host information 691 */ 692 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) 693 fatalerror("Ran out of memory."); 694 if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0) 695 hostname[0] = '\0'; 696 hostname[MAXHOSTNAMELEN - 1] = '\0'; 697 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 698 fatalerror("Ran out of memory."); 699 hrp->hostname = hostname; 700 hrp->hostinfo = NULL; 701 702 memset(&hints, 0, sizeof(hints)); 703 hints.ai_flags = AI_PASSIVE; 704 hints.ai_family = family; 705 hints.ai_socktype = SOCK_STREAM; 706 if (getaddrinfo(hrp->hostname, NULL, &hints, &res) == 0) 707 hrp->hostinfo = res; 708 hrp->statfile = _PATH_FTPDSTATFILE; 709 hrp->welcome = _PATH_FTPWELCOME; 710 hrp->loginmsg = _PATH_FTPLOGINMESG; 711 hrp->anonuser = "ftp"; 712 hrp->next = NULL; 713 thishost = firsthost = lhrp = hrp; 714 if ((fp = fopen(_PATH_FTPHOSTS, "r")) != NULL) { 715 int addrsize, gothost; 716 void *addr; 717 struct hostent *hp; 718 719 while ((line = fgetln(fp, &len)) != NULL) { 720 int i, hp_error; 721 722 /* skip comments */ 723 if (line[0] == '#') 724 continue; 725 if (line[len - 1] == '\n') { 726 line[len - 1] = '\0'; 727 mp = NULL; 728 } else { 729 if ((mp = malloc(len + 1)) == NULL) 730 fatalerror("Ran out of memory."); 731 memcpy(mp, line, len); 732 mp[len] = '\0'; 733 line = mp; 734 } 735 cp = strtok(line, " \t"); 736 /* skip empty lines */ 737 if (cp == NULL) 738 goto nextline; 739 vhost = cp; 740 741 /* set defaults */ 742 anonuser = "ftp"; 743 statfile = _PATH_FTPDSTATFILE; 744 welcome = _PATH_FTPWELCOME; 745 loginmsg = _PATH_FTPLOGINMESG; 746 747 /* 748 * Preparse the line so we can use its info 749 * for all the addresses associated with 750 * the virtual host name. 751 * Field 0, the virtual host name, is special: 752 * it's already parsed off and will be strdup'ed 753 * later, after we know its canonical form. 754 */ 755 for (i = 1; i < 5 && (cp = strtok(NULL, " \t")); i++) 756 if (*cp != '-' && (cp = strdup(cp))) 757 switch (i) { 758 case 1: /* anon user permissions */ 759 anonuser = cp; 760 break; 761 case 2: /* statistics file */ 762 statfile = cp; 763 break; 764 case 3: /* welcome message */ 765 welcome = cp; 766 break; 767 case 4: /* login message */ 768 loginmsg = cp; 769 break; 770 default: /* programming error */ 771 abort(); 772 /* NOTREACHED */ 773 } 774 775 hints.ai_flags = AI_PASSIVE; 776 hints.ai_family = family; 777 hints.ai_socktype = SOCK_STREAM; 778 if (getaddrinfo(vhost, NULL, &hints, &res) != 0) 779 goto nextline; 780 for (ai = res; ai != NULL && ai->ai_addr != NULL; 781 ai = ai->ai_next) { 782 783 gothost = 0; 784 for (hrp = firsthost; hrp != NULL; hrp = hrp->next) { 785 struct addrinfo *hi; 786 787 for (hi = hrp->hostinfo; hi != NULL; 788 hi = hi->ai_next) 789 if (hi->ai_addrlen == ai->ai_addrlen && 790 memcmp(hi->ai_addr, 791 ai->ai_addr, 792 ai->ai_addr->sa_len) == 0) { 793 gothost++; 794 break; 795 } 796 if (gothost) 797 break; 798 } 799 if (hrp == NULL) { 800 if ((hrp = malloc(sizeof(struct ftphost))) == NULL) 801 goto nextline; 802 hrp->hostname = NULL; 803 insert = 1; 804 } else { 805 if (hrp->hostinfo && hrp->hostinfo != res) 806 freeaddrinfo(hrp->hostinfo); 807 insert = 0; /* host already in the chain */ 808 } 809 hrp->hostinfo = res; 810 811 /* 812 * determine hostname to use. 813 * force defined name if there is a valid alias 814 * otherwise fallback to primary hostname 815 */ 816 /* XXX: getaddrinfo() can't do alias check */ 817 switch(hrp->hostinfo->ai_family) { 818 case AF_INET: 819 addr = &((struct sockaddr_in *)hrp->hostinfo->ai_addr)->sin_addr; 820 addrsize = sizeof(struct in_addr); 821 break; 822 case AF_INET6: 823 addr = &((struct sockaddr_in6 *)hrp->hostinfo->ai_addr)->sin6_addr; 824 addrsize = sizeof(struct in6_addr); 825 break; 826 default: 827 /* should not reach here */ 828 freeaddrinfo(hrp->hostinfo); 829 if (insert) 830 free(hrp); /*not in chain, can free*/ 831 else 832 hrp->hostinfo = NULL; /*mark as blank*/ 833 goto nextline; 834 /* NOTREACHED */ 835 } 836 if ((hp = getipnodebyaddr(addr, addrsize, 837 hrp->hostinfo->ai_family, 838 &hp_error)) != NULL) { 839 if (strcmp(vhost, hp->h_name) != 0) { 840 if (hp->h_aliases == NULL) 841 vhost = hp->h_name; 842 else { 843 i = 0; 844 while (hp->h_aliases[i] && 845 strcmp(vhost, hp->h_aliases[i]) != 0) 846 ++i; 847 if (hp->h_aliases[i] == NULL) 848 vhost = hp->h_name; 849 } 850 } 851 } 852 if (hrp->hostname && 853 strcmp(hrp->hostname, vhost) != 0) { 854 free(hrp->hostname); 855 hrp->hostname = NULL; 856 } 857 if (hrp->hostname == NULL && 858 (hrp->hostname = strdup(vhost)) == NULL) { 859 freeaddrinfo(hrp->hostinfo); 860 hrp->hostinfo = NULL; /* mark as blank */ 861 if (hp) 862 freehostent(hp); 863 goto nextline; 864 } 865 hrp->anonuser = anonuser; 866 hrp->statfile = statfile; 867 hrp->welcome = welcome; 868 hrp->loginmsg = loginmsg; 869 if (insert) { 870 hrp->next = NULL; 871 lhrp->next = hrp; 872 lhrp = hrp; 873 } 874 if (hp) 875 freehostent(hp); 876 } 877 nextline: 878 if (mp) 879 free(mp); 880 } 881 (void) fclose(fp); 882 } 883 } 884 885 static void 886 selecthost(union sockunion *su) 887 { 888 struct ftphost *hrp; 889 u_int16_t port; 890 #ifdef INET6 891 struct in6_addr *mapped_in6 = NULL; 892 #endif 893 struct addrinfo *hi; 894 895 #ifdef INET6 896 /* 897 * XXX IPv4 mapped IPv6 addr consideraton, 898 * specified in rfc2373. 899 */ 900 if (su->su_family == AF_INET6 && 901 IN6_IS_ADDR_V4MAPPED(&su->su_sin6.sin6_addr)) 902 mapped_in6 = &su->su_sin6.sin6_addr; 903 #endif 904 905 hrp = thishost = firsthost; /* default */ 906 port = su->su_port; 907 su->su_port = 0; 908 while (hrp != NULL) { 909 for (hi = hrp->hostinfo; hi != NULL; hi = hi->ai_next) { 910 if (memcmp(su, hi->ai_addr, hi->ai_addrlen) == 0) { 911 thishost = hrp; 912 goto found; 913 } 914 #ifdef INET6 915 /* XXX IPv4 mapped IPv6 addr consideraton */ 916 if (hi->ai_addr->sa_family == AF_INET && mapped_in6 != NULL && 917 (memcmp(&mapped_in6->s6_addr[12], 918 &((struct sockaddr_in *)hi->ai_addr)->sin_addr, 919 sizeof(struct in_addr)) == 0)) { 920 thishost = hrp; 921 goto found; 922 } 923 #endif 924 } 925 hrp = hrp->next; 926 } 927 found: 928 su->su_port = port; 929 /* setup static variables as appropriate */ 930 hostname = thishost->hostname; 931 ftpuser = thishost->anonuser; 932 } 933 #endif 934 935 /* 936 * Helper function for sgetpwnam(). 937 */ 938 static char * 939 sgetsave(char *s) 940 { 941 char *new = malloc(strlen(s) + 1); 942 943 if (new == NULL) { 944 reply(421, "Ran out of memory."); 945 dologout(1); 946 /* NOTREACHED */ 947 } 948 (void) strcpy(new, s); 949 return (new); 950 } 951 952 /* 953 * Save the result of a getpwnam. Used for USER command, since 954 * the data returned must not be clobbered by any other command 955 * (e.g., globbing). 956 * NB: The data returned by sgetpwnam() will remain valid until 957 * the next call to this function. Its difference from getpwnam() 958 * is that sgetpwnam() is known to be called from ftpd code only. 959 */ 960 static struct passwd * 961 sgetpwnam(char *name) 962 { 963 static struct passwd save; 964 struct passwd *p; 965 #ifdef __HAIKU__ 966 struct spwd *sp = NULL; 967 #endif 968 969 if ((p = getpwnam(name)) == NULL) 970 return (p); 971 #ifdef __HAIKU__ 972 if (strcmp(p->pw_passwd, "x") == 0) { 973 if ((sp = getspnam(name)) == NULL) 974 return (p); 975 } 976 #endif 977 if (save.pw_name) { 978 free(save.pw_name); 979 free(save.pw_passwd); 980 free(save.pw_gecos); 981 free(save.pw_dir); 982 free(save.pw_shell); 983 } 984 save = *p; 985 save.pw_name = sgetsave(p->pw_name); 986 #ifdef __HAIKU__ 987 if (sp) 988 save.pw_passwd = sgetsave(sp->sp_pwdp); 989 else 990 #endif 991 save.pw_passwd = sgetsave(p->pw_passwd); 992 save.pw_gecos = sgetsave(p->pw_gecos); 993 save.pw_dir = sgetsave(p->pw_dir); 994 save.pw_shell = sgetsave(p->pw_shell); 995 return (&save); 996 } 997 998 static int login_attempts; /* number of failed login attempts */ 999 static int askpasswd; /* had user command, ask for passwd */ 1000 static char curname[MAXLOGNAME]; /* current USER name */ 1001 1002 /* 1003 * USER command. 1004 * Sets global passwd pointer pw if named account exists and is acceptable; 1005 * sets askpasswd if a PASS command is expected. If logged in previously, 1006 * need to reset state. If name is "ftp" or "anonymous", the name is not in 1007 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 1008 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 1009 * requesting login privileges. Disallow anyone who does not have a standard 1010 * shell as returned by getusershell(). Disallow anyone mentioned in the file 1011 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 1012 */ 1013 void 1014 user(char *name) 1015 { 1016 int ecode; 1017 char *cp, *shell; 1018 1019 if (logged_in) { 1020 if (guest) { 1021 reply(530, "Can't change user from guest login."); 1022 return; 1023 } else if (dochroot) { 1024 reply(530, "Can't change user from chroot user."); 1025 return; 1026 } 1027 end_login(); 1028 } 1029 1030 guest = 0; 1031 #ifdef VIRTUAL_HOSTING 1032 pw = sgetpwnam(thishost->anonuser); 1033 #else 1034 pw = sgetpwnam("ftp"); 1035 #endif 1036 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 1037 if (checkuser(_PATH_FTPUSERS, "ftp", 0, NULL, &ecode) || 1038 (ecode != 0 && ecode != ENOENT)) 1039 reply(530, "User %s access denied.", name); 1040 else if (checkuser(_PATH_FTPUSERS, "anonymous", 0, NULL, &ecode) || 1041 (ecode != 0 && ecode != ENOENT)) 1042 reply(530, "User %s access denied.", name); 1043 else if (pw != NULL) { 1044 guest = 1; 1045 askpasswd = 1; 1046 reply(331, 1047 "Guest login ok, send your email address as password."); 1048 } else 1049 reply(530, "User %s unknown.", name); 1050 if (!askpasswd && logging) 1051 syslog(LOG_NOTICE, 1052 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 1053 return; 1054 } 1055 if (anon_only != 0) { 1056 reply(530, "Sorry, only anonymous ftp allowed."); 1057 return; 1058 } 1059 1060 if ((pw = sgetpwnam(name))) { 1061 if ((shell = pw->pw_shell) == NULL || *shell == 0) 1062 shell = _PATH_BSHELL; 1063 setusershell(); 1064 while ((cp = getusershell()) != NULL) 1065 if (strcmp(cp, shell) == 0) 1066 break; 1067 endusershell(); 1068 1069 if (cp == NULL || 1070 (checkuser(_PATH_FTPUSERS, name, 1, NULL, &ecode) || 1071 (ecode != 0 && ecode != ENOENT))) { 1072 reply(530, "User %s access denied.", name); 1073 if (logging) 1074 syslog(LOG_NOTICE, 1075 "FTP LOGIN REFUSED FROM %s, %s", 1076 remotehost, name); 1077 pw = NULL; 1078 return; 1079 } 1080 } 1081 if (logging) 1082 strlcpy(curname, name, sizeof(curname)); 1083 1084 pwok = 0; 1085 #ifdef USE_PAM 1086 /* XXX Kluge! The conversation mechanism needs to be fixed. */ 1087 #endif 1088 #ifdef HAVE_LIBOPIE 1089 if (opiechallenge(&opiedata, name, opieprompt) == 0) { 1090 pwok = (pw != NULL) && 1091 opieaccessfile(remotehost) && 1092 opiealways(pw->pw_dir); 1093 reply(331, "Response to %s %s for %s.", 1094 opieprompt, pwok ? "requested" : "required", name); 1095 } else 1096 #endif 1097 { 1098 pwok = 1; 1099 reply(331, "Password required for %s.", name); 1100 } 1101 askpasswd = 1; 1102 /* 1103 * Delay before reading passwd after first failed 1104 * attempt to slow down passwd-guessing programs. 1105 */ 1106 if (login_attempts) 1107 sleep(login_attempts); 1108 } 1109 1110 /* 1111 * Check if a user is in the file "fname", 1112 * return a pointer to a malloc'd string with the rest 1113 * of the matching line in "residue" if not NULL. 1114 */ 1115 static int 1116 checkuser(char *fname, char *name, int pwset, char **residue, int *ecode) 1117 { 1118 FILE *fd; 1119 int found = 0; 1120 size_t len; 1121 char *line, *mp, *p; 1122 1123 if (ecode != NULL) 1124 *ecode = 0; 1125 if ((fd = fopen(fname, "r")) != NULL) { 1126 while (!found && (line = fgetln(fd, &len)) != NULL) { 1127 /* skip comments */ 1128 if (line[0] == '#') 1129 continue; 1130 if (line[len - 1] == '\n') { 1131 line[len - 1] = '\0'; 1132 mp = NULL; 1133 } else { 1134 if ((mp = malloc(len + 1)) == NULL) 1135 fatalerror("Ran out of memory."); 1136 memcpy(mp, line, len); 1137 mp[len] = '\0'; 1138 line = mp; 1139 } 1140 /* avoid possible leading and trailing whitespace */ 1141 p = strtok(line, " \t"); 1142 /* skip empty lines */ 1143 if (p == NULL) 1144 goto nextline; 1145 /* 1146 * if first chr is '@', check group membership 1147 */ 1148 if (p[0] == '@') { 1149 int i = 0; 1150 struct group *grp; 1151 1152 if (p[1] == '\0') /* single @ matches anyone */ 1153 found = 1; 1154 else { 1155 if ((grp = getgrnam(p+1)) == NULL) 1156 goto nextline; 1157 /* 1158 * Check user's default group 1159 */ 1160 if (pwset && grp->gr_gid == pw->pw_gid) 1161 found = 1; 1162 /* 1163 * Check supplementary groups 1164 */ 1165 while (!found && grp->gr_mem[i]) 1166 found = strcmp(name, 1167 grp->gr_mem[i++]) 1168 == 0; 1169 } 1170 } 1171 /* 1172 * Otherwise, just check for username match 1173 */ 1174 else 1175 found = strcmp(p, name) == 0; 1176 /* 1177 * Save the rest of line to "residue" if matched 1178 */ 1179 if (found && residue) { 1180 if ((p = strtok(NULL, "")) != NULL) 1181 p += strspn(p, " \t"); 1182 if (p && *p) { 1183 if ((*residue = strdup(p)) == NULL) 1184 fatalerror("Ran out of memory."); 1185 } else 1186 *residue = NULL; 1187 } 1188 nextline: 1189 if (mp) 1190 free(mp); 1191 } 1192 (void) fclose(fd); 1193 } else if (ecode != NULL) 1194 *ecode = errno; 1195 return (found); 1196 } 1197 1198 /* 1199 * Terminate login as previous user, if any, resetting state; 1200 * used when USER command is given or login fails. 1201 */ 1202 static void 1203 end_login(void) 1204 { 1205 #ifdef USE_PAM 1206 int e; 1207 #endif 1208 1209 (void) seteuid(0); 1210 #ifdef LOGIN_CAP 1211 setusercontext(NULL, getpwuid(0), 0, LOGIN_SETALL & ~(LOGIN_SETLOGIN | 1212 LOGIN_SETUSER | LOGIN_SETGROUP | LOGIN_SETPATH | 1213 LOGIN_SETENV)); 1214 #endif 1215 if (logged_in && dowtmp) 1216 ftpd_logwtmp(wtmpid, NULL, NULL); 1217 pw = NULL; 1218 #ifdef USE_PAM 1219 if (pamh) { 1220 if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS) 1221 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1222 if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS) 1223 syslog(LOG_ERR, "pam_close_session: %s", pam_strerror(pamh, e)); 1224 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) 1225 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1226 pamh = NULL; 1227 } 1228 #endif 1229 logged_in = 0; 1230 guest = 0; 1231 dochroot = 0; 1232 } 1233 1234 #ifdef USE_PAM 1235 1236 /* 1237 * the following code is stolen from imap-uw PAM authentication module and 1238 * login.c 1239 */ 1240 #define COPY_STRING(s) (s ? strdup(s) : NULL) 1241 1242 struct cred_t { 1243 const char *uname; /* user name */ 1244 const char *pass; /* password */ 1245 }; 1246 typedef struct cred_t cred_t; 1247 1248 static int 1249 auth_conv(int num_msg, const struct pam_message **msg, 1250 struct pam_response **resp, void *appdata) 1251 { 1252 int i; 1253 cred_t *cred = (cred_t *) appdata; 1254 struct pam_response *reply; 1255 1256 reply = calloc(num_msg, sizeof *reply); 1257 if (reply == NULL) 1258 return PAM_BUF_ERR; 1259 1260 for (i = 0; i < num_msg; i++) { 1261 switch (msg[i]->msg_style) { 1262 case PAM_PROMPT_ECHO_ON: /* assume want user name */ 1263 reply[i].resp_retcode = PAM_SUCCESS; 1264 reply[i].resp = COPY_STRING(cred->uname); 1265 /* PAM frees resp. */ 1266 break; 1267 case PAM_PROMPT_ECHO_OFF: /* assume want password */ 1268 reply[i].resp_retcode = PAM_SUCCESS; 1269 reply[i].resp = COPY_STRING(cred->pass); 1270 /* PAM frees resp. */ 1271 break; 1272 case PAM_TEXT_INFO: 1273 case PAM_ERROR_MSG: 1274 reply[i].resp_retcode = PAM_SUCCESS; 1275 reply[i].resp = NULL; 1276 break; 1277 default: /* unknown message style */ 1278 free(reply); 1279 return PAM_CONV_ERR; 1280 } 1281 } 1282 1283 *resp = reply; 1284 return PAM_SUCCESS; 1285 } 1286 1287 /* 1288 * Attempt to authenticate the user using PAM. Returns 0 if the user is 1289 * authenticated, or 1 if not authenticated. If some sort of PAM system 1290 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this 1291 * function returns -1. This can be used as an indication that we should 1292 * fall back to a different authentication mechanism. 1293 */ 1294 static int 1295 auth_pam(struct passwd **ppw, const char *pass) 1296 { 1297 const char *tmpl_user; 1298 const void *item; 1299 int rval; 1300 int e; 1301 cred_t auth_cred = { (*ppw)->pw_name, pass }; 1302 struct pam_conv conv = { &auth_conv, &auth_cred }; 1303 1304 e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh); 1305 if (e != PAM_SUCCESS) { 1306 /* 1307 * In OpenPAM, it's OK to pass NULL to pam_strerror() 1308 * if context creation has failed in the first place. 1309 */ 1310 syslog(LOG_ERR, "pam_start: %s", pam_strerror(NULL, e)); 1311 return -1; 1312 } 1313 1314 e = pam_set_item(pamh, PAM_RHOST, remotehost); 1315 if (e != PAM_SUCCESS) { 1316 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s", 1317 pam_strerror(pamh, e)); 1318 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1319 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1320 } 1321 pamh = NULL; 1322 return -1; 1323 } 1324 1325 e = pam_authenticate(pamh, 0); 1326 switch (e) { 1327 case PAM_SUCCESS: 1328 /* 1329 * With PAM we support the concept of a "template" 1330 * user. The user enters a login name which is 1331 * authenticated by PAM, usually via a remote service 1332 * such as RADIUS or TACACS+. If authentication 1333 * succeeds, a different but related "template" name 1334 * is used for setting the credentials, shell, and 1335 * home directory. The name the user enters need only 1336 * exist on the remote authentication server, but the 1337 * template name must be present in the local password 1338 * database. 1339 * 1340 * This is supported by two various mechanisms in the 1341 * individual modules. However, from the application's 1342 * point of view, the template user is always passed 1343 * back as a changed value of the PAM_USER item. 1344 */ 1345 if ((e = pam_get_item(pamh, PAM_USER, &item)) == 1346 PAM_SUCCESS) { 1347 tmpl_user = (const char *) item; 1348 if (strcmp((*ppw)->pw_name, tmpl_user) != 0) 1349 *ppw = getpwnam(tmpl_user); 1350 } else 1351 syslog(LOG_ERR, "Couldn't get PAM_USER: %s", 1352 pam_strerror(pamh, e)); 1353 rval = 0; 1354 break; 1355 1356 case PAM_AUTH_ERR: 1357 case PAM_USER_UNKNOWN: 1358 case PAM_MAXTRIES: 1359 rval = 1; 1360 break; 1361 1362 default: 1363 syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e)); 1364 rval = -1; 1365 break; 1366 } 1367 1368 if (rval == 0) { 1369 e = pam_acct_mgmt(pamh, 0); 1370 if (e != PAM_SUCCESS) { 1371 syslog(LOG_ERR, "pam_acct_mgmt: %s", 1372 pam_strerror(pamh, e)); 1373 rval = 1; 1374 } 1375 } 1376 1377 if (rval != 0) { 1378 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { 1379 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); 1380 } 1381 pamh = NULL; 1382 } 1383 return rval; 1384 } 1385 1386 #endif /* USE_PAM */ 1387 1388 void 1389 pass(char *passwd) 1390 { 1391 int rval, ecode; 1392 FILE *fd; 1393 #ifdef LOGIN_CAP 1394 login_cap_t *lc = NULL; 1395 #endif 1396 #ifdef USE_PAM 1397 int e; 1398 #endif 1399 char *residue = NULL; 1400 char *xpasswd; 1401 1402 if (logged_in || askpasswd == 0) { 1403 reply(503, "Login with USER first."); 1404 return; 1405 } 1406 askpasswd = 0; 1407 if (!guest) { /* "ftp" is only account allowed no password */ 1408 if (pw == NULL) { 1409 rval = 1; /* failure below */ 1410 goto skip; 1411 } 1412 #ifdef USE_PAM 1413 rval = auth_pam(&pw, passwd); 1414 if (rval >= 0) { 1415 opieunlock(); 1416 goto skip; 1417 } 1418 #endif 1419 #ifdef HAVE_LIBOPIE 1420 if (opieverify(&opiedata, passwd) == 0) 1421 xpasswd = pw->pw_passwd; 1422 else 1423 #endif 1424 if (pwok) { 1425 xpasswd = crypt(passwd, pw->pw_passwd); 1426 if (passwd[0] == '\0' && pw->pw_passwd[0] != '\0') 1427 xpasswd = ":"; 1428 } else { 1429 rval = 1; 1430 goto skip; 1431 } 1432 rval = strcmp(pw->pw_passwd, xpasswd); 1433 #if (!defined(__BEOS__) && !defined(__HAIKU__)) 1434 if (pw->pw_expire && time(NULL) >= pw->pw_expire) 1435 rval = 1; /* failure */ 1436 #endif 1437 skip: 1438 /* 1439 * If rval == 1, the user failed the authentication check 1440 * above. If rval == 0, either PAM or local authentication 1441 * succeeded. 1442 */ 1443 if (rval) { 1444 reply(530, "Login incorrect."); 1445 if (logging) { 1446 syslog(LOG_NOTICE, 1447 "FTP LOGIN FAILED FROM %s", 1448 remotehost); 1449 syslog(LOG_AUTHPRIV | LOG_NOTICE, 1450 "FTP LOGIN FAILED FROM %s, %s", 1451 remotehost, curname); 1452 } 1453 pw = NULL; 1454 if (login_attempts++ >= 5) { 1455 syslog(LOG_NOTICE, 1456 "repeated login failures from %s", 1457 remotehost); 1458 exit(0); 1459 } 1460 return; 1461 } 1462 } 1463 login_attempts = 0; /* this time successful */ 1464 if (setegid(pw->pw_gid) < 0) { 1465 reply(550, "Can't set gid."); 1466 return; 1467 } 1468 /* May be overridden by login.conf */ 1469 (void) umask(defumask); 1470 #ifdef LOGIN_CAP 1471 if ((lc = login_getpwclass(pw)) != NULL) { 1472 char remote_ip[NI_MAXHOST]; 1473 1474 if (getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1475 remote_ip, sizeof(remote_ip) - 1, NULL, 0, 1476 NI_NUMERICHOST)) 1477 *remote_ip = 0; 1478 remote_ip[sizeof(remote_ip) - 1] = 0; 1479 if (!auth_hostok(lc, remotehost, remote_ip)) { 1480 syslog(LOG_INFO|LOG_AUTH, 1481 "FTP LOGIN FAILED (HOST) as %s: permission denied.", 1482 pw->pw_name); 1483 reply(530, "Permission denied."); 1484 pw = NULL; 1485 return; 1486 } 1487 if (!auth_timeok(lc, time(NULL))) { 1488 reply(530, "Login not available right now."); 1489 pw = NULL; 1490 return; 1491 } 1492 } 1493 setusercontext(lc, pw, 0, 1494 LOGIN_SETLOGIN|LOGIN_SETGROUP|LOGIN_SETPRIORITY| 1495 LOGIN_SETRESOURCES|LOGIN_SETUMASK|LOGIN_SETMAC); 1496 #elif !(defined(__BEOS__) || defined(__HAIKU__)) 1497 setlogin(pw->pw_name); 1498 (void) initgroups(pw->pw_name, pw->pw_gid); 1499 #endif 1500 1501 #ifdef USE_PAM 1502 if (pamh) { 1503 if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) { 1504 syslog(LOG_ERR, "pam_open_session: %s", pam_strerror(pamh, e)); 1505 } else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) != PAM_SUCCESS) { 1506 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); 1507 } 1508 } 1509 #endif 1510 1511 dochroot = 1512 checkuser(_PATH_FTPCHROOT, pw->pw_name, 1, &residue, &ecode) 1513 #ifdef LOGIN_CAP /* Allow login.conf configuration as well */ 1514 || login_getcapbool(lc, "ftp-chroot", 0) 1515 #endif 1516 ; 1517 /* 1518 * It is possible that checkuser() failed to open the chroot file. 1519 * If this is the case, report that logins are un-available, since we 1520 * have no way of checking whether or not the user should be chrooted. 1521 * We ignore ENOENT since it is not required that this file be present. 1522 */ 1523 if (ecode != 0 && ecode != ENOENT) { 1524 reply(530, "Login not available right now."); 1525 return; 1526 } 1527 chrootdir = NULL; 1528 1529 /* Disable wtmp logging when chrooting. */ 1530 if (dochroot || guest) 1531 dowtmp = 0; 1532 if (dowtmp) 1533 ftpd_logwtmp(wtmpid, pw->pw_name, 1534 (struct sockaddr *)&his_addr); 1535 logged_in = 1; 1536 1537 #ifdef LOGIN_CAP 1538 setusercontext(lc, pw, 0, LOGIN_SETRESOURCES); 1539 #endif 1540 1541 if (guest && stats && statfd < 0) { 1542 #ifdef VIRTUAL_HOSTING 1543 statfd = open(thishost->statfile, O_WRONLY|O_APPEND); 1544 #else 1545 statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND); 1546 #endif 1547 if (statfd < 0) 1548 stats = 0; 1549 } 1550 1551 #if (!defined(__BEOS__) && !defined(__HAIKU__)) 1552 /* 1553 * For a chrooted local user, 1554 * a) see whether ftpchroot(5) specifies a chroot directory, 1555 * b) extract the directory pathname from the line, 1556 * c) expand it to the absolute pathname if necessary. 1557 */ 1558 if (dochroot && residue && 1559 (chrootdir = strtok(residue, " \t")) != NULL) { 1560 if (chrootdir[0] != '/') 1561 asprintf(&chrootdir, "%s/%s", pw->pw_dir, chrootdir); 1562 else 1563 chrootdir = strdup(chrootdir); /* make it permanent */ 1564 if (chrootdir == NULL) 1565 fatalerror("Ran out of memory."); 1566 } 1567 #endif 1568 if (guest || dochroot) { 1569 #if (!defined(__BEOS__) && !defined(__HAIKU__)) 1570 /* 1571 * If no chroot directory set yet, use the login directory. 1572 * Copy it so it can be modified while pw->pw_dir stays intact. 1573 */ 1574 if (chrootdir == NULL && 1575 (chrootdir = strdup(pw->pw_dir)) == NULL) 1576 fatalerror("Ran out of memory."); 1577 /* 1578 * Check for the "/chroot/./home" syntax, 1579 * separate the chroot and home directory pathnames. 1580 */ 1581 if ((homedir = strstr(chrootdir, "/./")) != NULL) { 1582 *(homedir++) = '\0'; /* wipe '/' */ 1583 homedir++; /* skip '.' */ 1584 } else { 1585 /* 1586 * We MUST do a chdir() after the chroot. Otherwise 1587 * the old current directory will be accessible as "." 1588 * outside the new root! 1589 */ 1590 homedir = "/"; 1591 } 1592 /* 1593 * Finally, do chroot() 1594 */ 1595 if (chroot(chrootdir) < 0) { 1596 reply(550, "Can't change root."); 1597 goto bad; 1598 } 1599 #else 1600 homedir = "/"; 1601 #endif 1602 } else /* real user w/o chroot */ 1603 homedir = pw->pw_dir; 1604 /* 1605 * Set euid *before* doing chdir() so 1606 * a) the user won't be carried to a directory that he couldn't reach 1607 * on his own due to no permission to upper path components, 1608 * b) NFS mounted homedirs w/restrictive permissions will be accessible 1609 * (uid 0 has no root power over NFS if not mapped explicitly.) 1610 */ 1611 if (seteuid(pw->pw_uid) < 0) { 1612 if (guest || dochroot) { 1613 fatalerror("Can't set uid."); 1614 } else { 1615 reply(550, "Can't set uid."); 1616 goto bad; 1617 } 1618 } 1619 /* 1620 * Do not allow the session to live if we're chroot()'ed and chdir() 1621 * fails. Otherwise the chroot jail can be escaped. 1622 */ 1623 if (chdir(homedir) < 0) { 1624 if (guest || dochroot) { 1625 fatalerror("Can't change to base directory."); 1626 } else { 1627 if (chdir("/") < 0) { 1628 reply(550, "Root is inaccessible."); 1629 goto bad; 1630 } 1631 lreply(230, "No directory! Logging in with home=/."); 1632 } 1633 } 1634 1635 /* 1636 * Display a login message, if it exists. 1637 * N.B. reply(230,) must follow the message. 1638 */ 1639 #ifdef VIRTUAL_HOSTING 1640 fd = fopen(thishost->loginmsg, "r"); 1641 #else 1642 fd = fopen(_PATH_FTPLOGINMESG, "r"); 1643 #endif 1644 if (fd != NULL) { 1645 char *cp, line[LINE_MAX]; 1646 1647 while (fgets(line, sizeof(line), fd) != NULL) { 1648 if ((cp = strchr(line, '\n')) != NULL) 1649 *cp = '\0'; 1650 lreply(230, "%s", line); 1651 } 1652 (void) fflush(stdout); 1653 (void) fclose(fd); 1654 } 1655 if (guest) { 1656 if (ident != NULL) 1657 free(ident); 1658 ident = strdup(passwd); 1659 if (ident == NULL) 1660 fatalerror("Ran out of memory."); 1661 1662 reply(230, "Guest login ok, access restrictions apply."); 1663 #ifdef SETPROCTITLE 1664 #ifdef VIRTUAL_HOSTING 1665 if (thishost != firsthost) 1666 snprintf(proctitle, sizeof(proctitle), 1667 "%s: anonymous(%s)/%s", remotehost, hostname, 1668 passwd); 1669 else 1670 #endif 1671 snprintf(proctitle, sizeof(proctitle), 1672 "%s: anonymous/%s", remotehost, passwd); 1673 setproctitle("%s", proctitle); 1674 #endif /* SETPROCTITLE */ 1675 if (logging) 1676 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 1677 remotehost, passwd); 1678 } else { 1679 if (dochroot) 1680 reply(230, "User %s logged in, " 1681 "access restrictions apply.", pw->pw_name); 1682 else 1683 reply(230, "User %s logged in.", pw->pw_name); 1684 1685 #ifdef SETPROCTITLE 1686 snprintf(proctitle, sizeof(proctitle), 1687 "%s: user/%s", remotehost, pw->pw_name); 1688 setproctitle("%s", proctitle); 1689 #endif /* SETPROCTITLE */ 1690 if (logging) 1691 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 1692 remotehost, pw->pw_name); 1693 } 1694 if (logging && (guest || dochroot)) 1695 syslog(LOG_INFO, "session root changed to %s", chrootdir); 1696 #ifdef LOGIN_CAP 1697 login_close(lc); 1698 #endif 1699 if (residue) 1700 free(residue); 1701 return; 1702 bad: 1703 /* Forget all about it... */ 1704 #ifdef LOGIN_CAP 1705 login_close(lc); 1706 #endif 1707 if (residue) 1708 free(residue); 1709 end_login(); 1710 } 1711 1712 void 1713 retrieve(char *cmd, char *name) 1714 { 1715 FILE *fin, *dout; 1716 struct stat st; 1717 int (*closefunc)(FILE *); 1718 time_t start; 1719 char line[BUFSIZ]; 1720 1721 if (cmd == 0) { 1722 fin = fopen(name, "r"), closefunc = fclose; 1723 st.st_size = 0; 1724 } else { 1725 (void) snprintf(line, sizeof(line), cmd, name); 1726 name = line; 1727 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; 1728 st.st_size = -1; 1729 st.st_blksize = BUFSIZ; 1730 } 1731 if (fin == NULL) { 1732 if (errno != 0) { 1733 perror_reply(550, name); 1734 if (cmd == 0) { 1735 LOGCMD("get", name); 1736 } 1737 } 1738 return; 1739 } 1740 byte_count = -1; 1741 if (cmd == 0) { 1742 if (fstat(fileno(fin), &st) < 0) { 1743 perror_reply(550, name); 1744 goto done; 1745 } 1746 if (!S_ISREG(st.st_mode)) { 1747 /* 1748 * Never sending a raw directory is a workaround 1749 * for buggy clients that will attempt to RETR 1750 * a directory before listing it, e.g., Mozilla. 1751 * Preventing a guest from getting irregular files 1752 * is a simple security measure. 1753 */ 1754 if (S_ISDIR(st.st_mode) || guest) { 1755 reply(550, "%s: not a plain file.", name); 1756 goto done; 1757 } 1758 st.st_size = -1; 1759 /* st.st_blksize is set for all descriptor types */ 1760 } 1761 } 1762 if (restart_point) { 1763 if (type == TYPE_A) { 1764 off_t i, n; 1765 int c; 1766 1767 n = restart_point; 1768 i = 0; 1769 while (i++ < n) { 1770 if ((c=getc(fin)) == EOF) { 1771 perror_reply(550, name); 1772 goto done; 1773 } 1774 if (c == '\n') 1775 i++; 1776 } 1777 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { 1778 perror_reply(550, name); 1779 goto done; 1780 } 1781 } 1782 dout = dataconn(name, st.st_size, "w"); 1783 if (dout == NULL) 1784 goto done; 1785 time(&start); 1786 send_data(fin, dout, st.st_blksize, st.st_size, 1787 restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode)); 1788 if (cmd == 0 && guest && stats && byte_count > 0) 1789 logxfer(name, byte_count, start); 1790 (void) fclose(dout); 1791 data = -1; 1792 pdata = -1; 1793 done: 1794 if (cmd == 0) 1795 LOGBYTES("get", name, byte_count); 1796 (*closefunc)(fin); 1797 } 1798 1799 void 1800 store(char *name, char *mode, int unique) 1801 { 1802 int fd; 1803 FILE *fout, *din; 1804 int (*closefunc)(FILE *); 1805 1806 if (*mode == 'a') { /* APPE */ 1807 if (unique) { 1808 /* Programming error */ 1809 syslog(LOG_ERR, "Internal: unique flag to APPE"); 1810 unique = 0; 1811 } 1812 if (guest && noguestmod) { 1813 reply(550, "Appending to existing file denied."); 1814 goto err; 1815 } 1816 restart_point = 0; /* not affected by preceding REST */ 1817 } 1818 if (unique) /* STOU overrides REST */ 1819 restart_point = 0; 1820 if (guest && noguestmod) { 1821 if (restart_point) { /* guest STOR w/REST */ 1822 reply(550, "Modifying existing file denied."); 1823 goto err; 1824 } else /* treat guest STOR as STOU */ 1825 unique = 1; 1826 } 1827 1828 if (restart_point) 1829 mode = "r+"; /* so ASCII manual seek can work */ 1830 if (unique) { 1831 if ((fd = guniquefd(name, &name)) < 0) 1832 goto err; 1833 fout = fdopen(fd, mode); 1834 } else 1835 fout = fopen(name, mode); 1836 closefunc = fclose; 1837 if (fout == NULL) { 1838 perror_reply(553, name); 1839 goto err; 1840 } 1841 byte_count = -1; 1842 if (restart_point) { 1843 if (type == TYPE_A) { 1844 off_t i, n; 1845 int c; 1846 1847 n = restart_point; 1848 i = 0; 1849 while (i++ < n) { 1850 if ((c=getc(fout)) == EOF) { 1851 perror_reply(550, name); 1852 goto done; 1853 } 1854 if (c == '\n') 1855 i++; 1856 } 1857 /* 1858 * We must do this seek to "current" position 1859 * because we are changing from reading to 1860 * writing. 1861 */ 1862 if (fseeko(fout, 0, SEEK_CUR) < 0) { 1863 perror_reply(550, name); 1864 goto done; 1865 } 1866 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { 1867 perror_reply(550, name); 1868 goto done; 1869 } 1870 } 1871 din = dataconn(name, -1, "r"); 1872 if (din == NULL) 1873 goto done; 1874 if (receive_data(din, fout) == 0) { 1875 if (unique) 1876 reply(226, "Transfer complete (unique file name:%s).", 1877 name); 1878 else 1879 reply(226, "Transfer complete."); 1880 } 1881 (void) fclose(din); 1882 data = -1; 1883 pdata = -1; 1884 done: 1885 LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count); 1886 (*closefunc)(fout); 1887 return; 1888 err: 1889 LOGCMD(*mode == 'a' ? "append" : "put" , name); 1890 return; 1891 } 1892 1893 static FILE * 1894 getdatasock(char *mode) 1895 { 1896 int on = 1, s, t, tries; 1897 1898 if (data >= 0) 1899 return (fdopen(data, mode)); 1900 1901 s = socket(data_dest.su_family, SOCK_STREAM, 0); 1902 if (s < 0) 1903 goto bad; 1904 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 1905 syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m"); 1906 /* anchor socket to avoid multi-homing problems */ 1907 data_source = ctrl_addr; 1908 data_source.su_port = htons(dataport); 1909 (void) seteuid(0); 1910 for (tries = 1; ; tries++) { 1911 /* 1912 * We should loop here since it's possible that 1913 * another ftpd instance has passed this point and is 1914 * trying to open a data connection in active mode now. 1915 * Until the other connection is opened, we'll be getting 1916 * EADDRINUSE because no SOCK_STREAM sockets in the system 1917 * can share both local and remote addresses, localIP:20 1918 * and *:* in this case. 1919 */ 1920 if (bind(s, (struct sockaddr *)&data_source, 1921 data_source.su_len) >= 0) 1922 break; 1923 if (errno != EADDRINUSE || tries > 10) 1924 goto bad; 1925 sleep(tries); 1926 } 1927 (void) seteuid(pw->pw_uid); 1928 #ifdef IP_TOS 1929 if (data_source.su_family == AF_INET) 1930 { 1931 on = IPTOS_THROUGHPUT; 1932 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0) 1933 syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m"); 1934 } 1935 #endif 1936 #ifdef TCP_NOPUSH 1937 /* 1938 * Turn off push flag to keep sender TCP from sending short packets 1939 * at the boundaries of each write(). 1940 */ 1941 on = 1; 1942 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0) 1943 syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m"); 1944 #endif 1945 return (fdopen(s, mode)); 1946 bad: 1947 /* Return the real value of errno (close may change it) */ 1948 t = errno; 1949 (void) seteuid(pw->pw_uid); 1950 (void) close(s); 1951 errno = t; 1952 return (NULL); 1953 } 1954 1955 static FILE * 1956 dataconn(char *name, off_t size, char *mode) 1957 { 1958 char sizebuf[32]; 1959 FILE *file; 1960 int retry = 0, tos, conerrno; 1961 1962 file_size = size; 1963 byte_count = 0; 1964 if (size != -1) 1965 (void) snprintf(sizebuf, sizeof(sizebuf), 1966 " (%jd bytes)", (intmax_t)size); 1967 else 1968 *sizebuf = '\0'; 1969 if (pdata >= 0) { 1970 union sockunion from; 1971 socklen_t fromlen = ctrl_addr.su_len; 1972 int flags, s; 1973 struct timeval timeout; 1974 fd_set set; 1975 1976 FD_ZERO(&set); 1977 FD_SET(pdata, &set); 1978 1979 timeout.tv_usec = 0; 1980 timeout.tv_sec = 120; 1981 1982 /* 1983 * Granted a socket is in the blocking I/O mode, 1984 * accept() will block after a successful select() 1985 * if the selected connection dies in between. 1986 * Therefore set the non-blocking I/O flag here. 1987 */ 1988 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 1989 fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1) 1990 goto pdata_err; 1991 if (select(pdata+1, &set, NULL, NULL, &timeout) <= 0 || 1992 (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0) 1993 goto pdata_err; 1994 (void) close(pdata); 1995 pdata = s; 1996 /* 1997 * Unset the inherited non-blocking I/O flag 1998 * on the child socket so stdio can work on it. 1999 */ 2000 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || 2001 fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1) 2002 goto pdata_err; 2003 #ifdef IP_TOS 2004 if (from.su_family == AF_INET) 2005 { 2006 tos = IPTOS_THROUGHPUT; 2007 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0) 2008 syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m"); 2009 } 2010 #endif 2011 reply(150, "Opening %s mode data connection for '%s'%s.", 2012 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 2013 return (fdopen(pdata, mode)); 2014 pdata_err: 2015 reply(425, "Can't open data connection."); 2016 (void) close(pdata); 2017 pdata = -1; 2018 return (NULL); 2019 } 2020 if (data >= 0) { 2021 reply(125, "Using existing data connection for '%s'%s.", 2022 name, sizebuf); 2023 usedefault = 1; 2024 return (fdopen(data, mode)); 2025 } 2026 if (usedefault) 2027 data_dest = his_addr; 2028 usedefault = 1; 2029 do { 2030 file = getdatasock(mode); 2031 if (file == NULL) { 2032 char hostbuf[NI_MAXHOST], portbuf[NI_MAXSERV]; 2033 2034 if (getnameinfo((struct sockaddr *)&data_source, 2035 data_source.su_len, 2036 hostbuf, sizeof(hostbuf) - 1, 2037 portbuf, sizeof(portbuf) - 1, 2038 NI_NUMERICHOST|NI_NUMERICSERV)) 2039 *hostbuf = *portbuf = 0; 2040 hostbuf[sizeof(hostbuf) - 1] = 0; 2041 portbuf[sizeof(portbuf) - 1] = 0; 2042 reply(425, "Can't create data socket (%s,%s): %s.", 2043 hostbuf, portbuf, strerror(errno)); 2044 return (NULL); 2045 } 2046 data = fileno(file); 2047 conerrno = 0; 2048 if (connect(data, (struct sockaddr *)&data_dest, 2049 data_dest.su_len) == 0) 2050 break; 2051 conerrno = errno; 2052 (void) fclose(file); 2053 data = -1; 2054 if (conerrno == EADDRINUSE) { 2055 sleep(swaitint); 2056 retry += swaitint; 2057 } else { 2058 break; 2059 } 2060 } while (retry <= swaitmax); 2061 if (conerrno != 0) { 2062 reply(425, "Can't build data connection: %s.", 2063 strerror(conerrno)); 2064 return (NULL); 2065 } 2066 reply(150, "Opening %s mode data connection for '%s'%s.", 2067 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 2068 return (file); 2069 } 2070 2071 /* 2072 * A helper macro to avoid code duplication 2073 * in send_data() and receive_data(). 2074 * 2075 * XXX We have to block SIGURG during putc() because BSD stdio 2076 * is unable to restart interrupted write operations and hence 2077 * the entire buffer contents will be lost as soon as a write() 2078 * call indicates EINTR to stdio. 2079 */ 2080 #define FTPD_PUTC(ch, file, label) \ 2081 do { \ 2082 int ret; \ 2083 \ 2084 do { \ 2085 START_UNSAFE; \ 2086 ret = putc((ch), (file)); \ 2087 END_UNSAFE; \ 2088 CHECKOOB(return (-1)) \ 2089 else if (ferror(file)) \ 2090 goto label; \ 2091 clearerr(file); \ 2092 } while (ret == EOF); \ 2093 } while (0) 2094 2095 /* 2096 * Transfer the contents of "instr" to "outstr" peer using the appropriate 2097 * encapsulation of the data subject to Mode, Structure, and Type. 2098 * 2099 * NB: Form isn't handled. 2100 */ 2101 static int 2102 send_data(FILE *instr, FILE *outstr, size_t blksize, off_t filesize, int isreg) 2103 { 2104 int c, cp, filefd, netfd; 2105 char *buf; 2106 2107 STARTXFER; 2108 2109 switch (type) { 2110 2111 case TYPE_A: 2112 cp = EOF; 2113 for (;;) { 2114 c = getc(instr); 2115 CHECKOOB(return (-1)) 2116 else if (c == EOF && ferror(instr)) 2117 goto file_err; 2118 if (c == EOF) { 2119 if (ferror(instr)) { /* resume after OOB */ 2120 clearerr(instr); 2121 continue; 2122 } 2123 if (feof(instr)) /* EOF */ 2124 break; 2125 syslog(LOG_ERR, "Internal: impossible condition" 2126 " on file after getc()"); 2127 goto file_err; 2128 } 2129 if (c == '\n' && cp != '\r') { 2130 FTPD_PUTC('\r', outstr, data_err); 2131 byte_count++; 2132 } 2133 FTPD_PUTC(c, outstr, data_err); 2134 byte_count++; 2135 cp = c; 2136 } 2137 #ifdef notyet /* BSD stdio isn't ready for that */ 2138 while (fflush(outstr) == EOF) { 2139 CHECKOOB(return (-1)) 2140 else 2141 goto data_err; 2142 clearerr(outstr); 2143 } 2144 ENDXFER; 2145 #else 2146 ENDXFER; 2147 if (fflush(outstr) == EOF) 2148 goto data_err; 2149 #endif 2150 reply(226, "Transfer complete."); 2151 return (0); 2152 2153 case TYPE_I: 2154 case TYPE_L: 2155 /* 2156 * isreg is only set if we are not doing restart and we 2157 * are sending a regular file 2158 */ 2159 netfd = fileno(outstr); 2160 filefd = fileno(instr); 2161 2162 #if (!defined(__BEOS__) && !defined(__HAIKU__)) 2163 if (isreg) { 2164 char *msg = "Transfer complete."; 2165 off_t cnt, offset; 2166 int err; 2167 2168 cnt = offset = 0; 2169 2170 while (filesize > 0) { 2171 err = sendfile(filefd, netfd, offset, 0, 2172 NULL, &cnt, 0); 2173 /* 2174 * Calculate byte_count before OOB processing. 2175 * It can be used in myoob() later. 2176 */ 2177 byte_count += cnt; 2178 offset += cnt; 2179 filesize -= cnt; 2180 CHECKOOB(return (-1)) 2181 else if (err == -1) { 2182 if (errno != EINTR && 2183 cnt == 0 && offset == 0) 2184 goto oldway; 2185 goto data_err; 2186 } 2187 if (err == -1) /* resume after OOB */ 2188 continue; 2189 /* 2190 * We hit the EOF prematurely. 2191 * Perhaps the file was externally truncated. 2192 */ 2193 if (cnt == 0) { 2194 msg = "Transfer finished due to " 2195 "premature end of file."; 2196 break; 2197 } 2198 } 2199 ENDXFER; 2200 reply(226, "%s", msg); 2201 return (0); 2202 } 2203 2204 oldway: 2205 #endif /* !__BEOS__ */ 2206 if ((buf = malloc(blksize)) == NULL) { 2207 ENDXFER; 2208 reply(451, "Ran out of memory."); 2209 return (-1); 2210 } 2211 2212 for (;;) { 2213 int cnt, len; 2214 char *bp; 2215 2216 cnt = read(filefd, buf, blksize); 2217 CHECKOOB(free(buf); return (-1)) 2218 else if (cnt < 0) { 2219 free(buf); 2220 goto file_err; 2221 } 2222 if (cnt < 0) /* resume after OOB */ 2223 continue; 2224 if (cnt == 0) /* EOF */ 2225 break; 2226 for (len = cnt, bp = buf; len > 0;) { 2227 cnt = write(netfd, bp, len); 2228 CHECKOOB(free(buf); return (-1)) 2229 else if (cnt < 0) { 2230 free(buf); 2231 goto data_err; 2232 } 2233 if (cnt <= 0) 2234 continue; 2235 len -= cnt; 2236 bp += cnt; 2237 byte_count += cnt; 2238 } 2239 } 2240 ENDXFER; 2241 free(buf); 2242 reply(226, "Transfer complete."); 2243 return (0); 2244 default: 2245 ENDXFER; 2246 reply(550, "Unimplemented TYPE %d in send_data.", type); 2247 return (-1); 2248 } 2249 2250 data_err: 2251 ENDXFER; 2252 perror_reply(426, "Data connection"); 2253 return (-1); 2254 2255 file_err: 2256 ENDXFER; 2257 perror_reply(551, "Error on input file"); 2258 return (-1); 2259 } 2260 2261 /* 2262 * Transfer data from peer to "outstr" using the appropriate encapulation of 2263 * the data subject to Mode, Structure, and Type. 2264 * 2265 * N.B.: Form isn't handled. 2266 */ 2267 static int 2268 receive_data(FILE *instr, FILE *outstr) 2269 { 2270 int c, cp; 2271 int bare_lfs = 0; 2272 2273 STARTXFER; 2274 2275 switch (type) { 2276 2277 case TYPE_I: 2278 case TYPE_L: 2279 for (;;) { 2280 int cnt, len; 2281 char *bp; 2282 char buf[BUFSIZ]; 2283 2284 cnt = read(fileno(instr), buf, sizeof(buf)); 2285 CHECKOOB(return (-1)) 2286 else if (cnt < 0) 2287 goto data_err; 2288 if (cnt < 0) /* resume after OOB */ 2289 continue; 2290 if (cnt == 0) /* EOF */ 2291 break; 2292 for (len = cnt, bp = buf; len > 0;) { 2293 cnt = write(fileno(outstr), bp, len); 2294 CHECKOOB(return (-1)) 2295 else if (cnt < 0) 2296 goto file_err; 2297 if (cnt <= 0) 2298 continue; 2299 len -= cnt; 2300 bp += cnt; 2301 byte_count += cnt; 2302 } 2303 } 2304 ENDXFER; 2305 return (0); 2306 2307 case TYPE_E: 2308 ENDXFER; 2309 reply(553, "TYPE E not implemented."); 2310 return (-1); 2311 2312 case TYPE_A: 2313 cp = EOF; 2314 for (;;) { 2315 c = getc(instr); 2316 CHECKOOB(return (-1)) 2317 else if (c == EOF && ferror(instr)) 2318 goto data_err; 2319 if (c == EOF && ferror(instr)) { /* resume after OOB */ 2320 clearerr(instr); 2321 continue; 2322 } 2323 2324 if (cp == '\r') { 2325 if (c != '\n') 2326 FTPD_PUTC('\r', outstr, file_err); 2327 } else 2328 if (c == '\n') 2329 bare_lfs++; 2330 if (c == '\r') { 2331 byte_count++; 2332 cp = c; 2333 continue; 2334 } 2335 2336 /* Check for EOF here in order not to lose last \r. */ 2337 if (c == EOF) { 2338 if (feof(instr)) /* EOF */ 2339 break; 2340 syslog(LOG_ERR, "Internal: impossible condition" 2341 " on data stream after getc()"); 2342 goto data_err; 2343 } 2344 2345 byte_count++; 2346 FTPD_PUTC(c, outstr, file_err); 2347 cp = c; 2348 } 2349 #ifdef notyet /* BSD stdio isn't ready for that */ 2350 while (fflush(outstr) == EOF) { 2351 CHECKOOB(return (-1)) 2352 else 2353 goto file_err; 2354 clearerr(outstr); 2355 } 2356 ENDXFER; 2357 #else 2358 ENDXFER; 2359 if (fflush(outstr) == EOF) 2360 goto file_err; 2361 #endif 2362 if (bare_lfs) { 2363 lreply(226, 2364 "WARNING! %d bare linefeeds received in ASCII mode.", 2365 bare_lfs); 2366 (void)printf(" File may not have transferred correctly.\r\n"); 2367 } 2368 return (0); 2369 default: 2370 ENDXFER; 2371 reply(550, "Unimplemented TYPE %d in receive_data.", type); 2372 return (-1); 2373 } 2374 2375 data_err: 2376 ENDXFER; 2377 perror_reply(426, "Data connection"); 2378 return (-1); 2379 2380 file_err: 2381 ENDXFER; 2382 perror_reply(452, "Error writing to file"); 2383 return (-1); 2384 } 2385 2386 void 2387 statfilecmd(char *filename) 2388 { 2389 FILE *fin; 2390 int atstart; 2391 int c, code; 2392 char line[LINE_MAX]; 2393 struct stat st; 2394 2395 code = lstat(filename, &st) == 0 && S_ISDIR(st.st_mode) ? 212 : 213; 2396 (void)snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename); 2397 fin = ftpd_popen(line, "r"); 2398 if (fin == NULL) { 2399 perror_reply(551, filename); 2400 return; 2401 } 2402 lreply(code, "Status of %s:", filename); 2403 atstart = 1; 2404 while ((c = getc(fin)) != EOF) { 2405 if (c == '\n') { 2406 if (ferror(stdout)){ 2407 perror_reply(421, "Control connection"); 2408 (void) ftpd_pclose(fin); 2409 dologout(1); 2410 /* NOTREACHED */ 2411 } 2412 if (ferror(fin)) { 2413 perror_reply(551, filename); 2414 (void) ftpd_pclose(fin); 2415 return; 2416 } 2417 (void) putc('\r', stdout); 2418 } 2419 /* 2420 * RFC 959 says neutral text should be prepended before 2421 * a leading 3-digit number followed by whitespace, but 2422 * many ftp clients can be confused by any leading digits, 2423 * as a matter of fact. 2424 */ 2425 if (atstart && isdigit(c)) 2426 (void) putc(' ', stdout); 2427 (void) putc(c, stdout); 2428 atstart = (c == '\n'); 2429 } 2430 (void) ftpd_pclose(fin); 2431 reply(code, "End of status."); 2432 } 2433 2434 void 2435 statcmd(void) 2436 { 2437 union sockunion *su; 2438 u_char *a, *p; 2439 char hname[NI_MAXHOST]; 2440 int ispassive; 2441 2442 if (hostinfo) { 2443 lreply(211, "%s FTP server status:", hostname); 2444 printf(" %s\r\n", version); 2445 } else 2446 lreply(211, "FTP server status:"); 2447 printf(" Connected to %s", remotehost); 2448 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 2449 hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) { 2450 hname[sizeof(hname) - 1] = 0; 2451 if (strcmp(hname, remotehost) != 0) 2452 printf(" (%s)", hname); 2453 } 2454 printf("\r\n"); 2455 if (logged_in) { 2456 if (guest) 2457 printf(" Logged in anonymously\r\n"); 2458 else 2459 printf(" Logged in as %s\r\n", pw->pw_name); 2460 } else if (askpasswd) 2461 printf(" Waiting for password\r\n"); 2462 else 2463 printf(" Waiting for user name\r\n"); 2464 printf(" TYPE: %s", typenames[type]); 2465 if (type == TYPE_A || type == TYPE_E) 2466 printf(", FORM: %s", formnames[form]); 2467 if (type == TYPE_L) 2468 #if CHAR_BIT == 8 2469 printf(" %d", CHAR_BIT); 2470 #else 2471 printf(" %d", bytesize); /* need definition! */ 2472 #endif 2473 printf("; STRUcture: %s; transfer MODE: %s\r\n", 2474 strunames[stru], modenames[mode]); 2475 if (data != -1) 2476 printf(" Data connection open\r\n"); 2477 else if (pdata != -1) { 2478 ispassive = 1; 2479 su = &pasv_addr; 2480 goto printaddr; 2481 } else if (usedefault == 0) { 2482 ispassive = 0; 2483 su = &data_dest; 2484 printaddr: 2485 #define UC(b) (((int) b) & 0xff) 2486 if (epsvall) { 2487 printf(" EPSV only mode (EPSV ALL)\r\n"); 2488 goto epsvonly; 2489 } 2490 2491 /* PORT/PASV */ 2492 if (su->su_family == AF_INET) { 2493 a = (u_char *) &su->su_sin.sin_addr; 2494 p = (u_char *) &su->su_sin.sin_port; 2495 printf(" %s (%d,%d,%d,%d,%d,%d)\r\n", 2496 ispassive ? "PASV" : "PORT", 2497 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2498 UC(p[0]), UC(p[1])); 2499 } 2500 2501 /* LPRT/LPSV */ 2502 { 2503 int alen, af, i; 2504 2505 switch (su->su_family) { 2506 case AF_INET: 2507 a = (u_char *) &su->su_sin.sin_addr; 2508 p = (u_char *) &su->su_sin.sin_port; 2509 alen = sizeof(su->su_sin.sin_addr); 2510 af = 4; 2511 break; 2512 case AF_INET6: 2513 a = (u_char *) &su->su_sin6.sin6_addr; 2514 p = (u_char *) &su->su_sin6.sin6_port; 2515 alen = sizeof(su->su_sin6.sin6_addr); 2516 af = 6; 2517 break; 2518 default: 2519 af = 0; 2520 break; 2521 } 2522 if (af) { 2523 printf(" %s (%d,%d,", ispassive ? "LPSV" : "LPRT", 2524 af, alen); 2525 for (i = 0; i < alen; i++) 2526 printf("%d,", UC(a[i])); 2527 printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); 2528 } 2529 } 2530 2531 epsvonly:; 2532 /* EPRT/EPSV */ 2533 { 2534 int af; 2535 2536 switch (su->su_family) { 2537 case AF_INET: 2538 af = 1; 2539 break; 2540 case AF_INET6: 2541 af = 2; 2542 break; 2543 default: 2544 af = 0; 2545 break; 2546 } 2547 if (af) { 2548 union sockunion tmp; 2549 2550 tmp = *su; 2551 if (tmp.su_family == AF_INET6) 2552 tmp.su_sin6.sin6_scope_id = 0; 2553 if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len, 2554 hname, sizeof(hname) - 1, NULL, 0, 2555 NI_NUMERICHOST)) { 2556 hname[sizeof(hname) - 1] = 0; 2557 printf(" %s |%d|%s|%d|\r\n", 2558 ispassive ? "EPSV" : "EPRT", 2559 af, hname, htons(tmp.su_port)); 2560 } 2561 } 2562 } 2563 #undef UC 2564 } else 2565 printf(" No data connection\r\n"); 2566 reply(211, "End of status."); 2567 } 2568 2569 void 2570 fatalerror(char *s) 2571 { 2572 2573 reply(451, "Error in server: %s", s); 2574 reply(221, "Closing connection due to server error."); 2575 dologout(0); 2576 /* NOTREACHED */ 2577 } 2578 2579 void 2580 reply(int n, const char *fmt, ...) 2581 { 2582 va_list ap; 2583 2584 (void)printf("%d ", n); 2585 va_start(ap, fmt); 2586 (void)vprintf(fmt, ap); 2587 va_end(ap); 2588 (void)printf("\r\n"); 2589 (void)fflush(stdout); 2590 if (ftpdebug) { 2591 syslog(LOG_DEBUG, "<--- %d ", n); 2592 va_start(ap, fmt); 2593 vsyslog(LOG_DEBUG, fmt, ap); 2594 va_end(ap); 2595 } 2596 } 2597 2598 void 2599 lreply(int n, const char *fmt, ...) 2600 { 2601 va_list ap; 2602 2603 (void)printf("%d- ", n); 2604 va_start(ap, fmt); 2605 (void)vprintf(fmt, ap); 2606 va_end(ap); 2607 (void)printf("\r\n"); 2608 (void)fflush(stdout); 2609 if (ftpdebug) { 2610 syslog(LOG_DEBUG, "<--- %d- ", n); 2611 va_start(ap, fmt); 2612 vsyslog(LOG_DEBUG, fmt, ap); 2613 va_end(ap); 2614 } 2615 } 2616 2617 static void 2618 ack(char *s) 2619 { 2620 2621 reply(250, "%s command successful.", s); 2622 } 2623 2624 void 2625 nack(char *s) 2626 { 2627 2628 reply(502, "%s command not implemented.", s); 2629 } 2630 2631 /* ARGSUSED */ 2632 void 2633 yyerror(char *s) 2634 { 2635 char *cp; 2636 2637 if ((cp = strchr(cbuf,'\n'))) 2638 *cp = '\0'; 2639 reply(500, "%s: command not understood.", cbuf); 2640 } 2641 2642 void 2643 delete(char *name) 2644 { 2645 struct stat st; 2646 2647 LOGCMD("delete", name); 2648 if (lstat(name, &st) < 0) { 2649 perror_reply(550, name); 2650 return; 2651 } 2652 if (S_ISDIR(st.st_mode)) { 2653 if (rmdir(name) < 0) { 2654 perror_reply(550, name); 2655 return; 2656 } 2657 goto done; 2658 } 2659 if (guest && noguestmod) { 2660 reply(550, "Operation not permitted."); 2661 return; 2662 } 2663 if (unlink(name) < 0) { 2664 perror_reply(550, name); 2665 return; 2666 } 2667 done: 2668 ack("DELE"); 2669 } 2670 2671 void 2672 cwd(char *path) 2673 { 2674 2675 if (chdir(path) < 0) 2676 perror_reply(550, path); 2677 else 2678 ack("CWD"); 2679 } 2680 2681 void 2682 makedir(char *name) 2683 { 2684 char *s; 2685 2686 LOGCMD("mkdir", name); 2687 if (guest && noguestmkd) 2688 reply(550, "Operation not permitted."); 2689 else if (mkdir(name, 0777) < 0) 2690 perror_reply(550, name); 2691 else { 2692 if ((s = doublequote(name)) == NULL) 2693 fatalerror("Ran out of memory."); 2694 reply(257, "\"%s\" directory created.", s); 2695 free(s); 2696 } 2697 } 2698 2699 void 2700 removedir(char *name) 2701 { 2702 2703 LOGCMD("rmdir", name); 2704 if (rmdir(name) < 0) 2705 perror_reply(550, name); 2706 else 2707 ack("RMD"); 2708 } 2709 2710 void 2711 pwd(void) 2712 { 2713 char *s, path[MAXPATHLEN + 1]; 2714 2715 if (getcwd(path, sizeof(path)) == NULL) 2716 perror_reply(550, "Get current directory"); 2717 else { 2718 if ((s = doublequote(path)) == NULL) 2719 fatalerror("Ran out of memory."); 2720 reply(257, "\"%s\" is current directory.", s); 2721 free(s); 2722 } 2723 } 2724 2725 char * 2726 renamefrom(char *name) 2727 { 2728 struct stat st; 2729 2730 if (guest && noguestmod) { 2731 reply(550, "Operation not permitted."); 2732 return (NULL); 2733 } 2734 if (lstat(name, &st) < 0) { 2735 perror_reply(550, name); 2736 return (NULL); 2737 } 2738 reply(350, "File exists, ready for destination name."); 2739 return (name); 2740 } 2741 2742 void 2743 renamecmd(char *from, char *to) 2744 { 2745 struct stat st; 2746 2747 LOGCMD2("rename", from, to); 2748 2749 if (guest && (stat(to, &st) == 0)) { 2750 reply(550, "%s: permission denied.", to); 2751 return; 2752 } 2753 2754 if (rename(from, to) < 0) 2755 perror_reply(550, "rename"); 2756 else 2757 ack("RNTO"); 2758 } 2759 2760 static void 2761 dolog(struct sockaddr *who) 2762 { 2763 char who_name[NI_MAXHOST]; 2764 2765 realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len); 2766 remotehost[sizeof(remotehost) - 1] = 0; 2767 if (getnameinfo(who, who->sa_len, 2768 who_name, sizeof(who_name) - 1, NULL, 0, NI_NUMERICHOST)) 2769 *who_name = 0; 2770 who_name[sizeof(who_name) - 1] = 0; 2771 2772 #ifdef SETPROCTITLE 2773 #ifdef VIRTUAL_HOSTING 2774 if (thishost != firsthost) 2775 snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)", 2776 remotehost, hostname); 2777 else 2778 #endif 2779 snprintf(proctitle, sizeof(proctitle), "%s: connected", 2780 remotehost); 2781 setproctitle("%s", proctitle); 2782 #endif /* SETPROCTITLE */ 2783 2784 if (logging) { 2785 #ifdef VIRTUAL_HOSTING 2786 if (thishost != firsthost) 2787 syslog(LOG_INFO, "connection from %s (%s) to %s", 2788 remotehost, who_name, hostname); 2789 else 2790 #endif 2791 syslog(LOG_INFO, "connection from %s (%s)", 2792 remotehost, who_name); 2793 } 2794 } 2795 2796 /* 2797 * Record logout in wtmp file 2798 * and exit with supplied status. 2799 */ 2800 void 2801 dologout(int status) 2802 { 2803 2804 if (logged_in && dowtmp) { 2805 (void) seteuid(0); 2806 #ifdef LOGIN_CAP 2807 setusercontext(NULL, getpwuid(0), 0, LOGIN_SETALL & ~(LOGIN_SETLOGIN | 2808 LOGIN_SETUSER | LOGIN_SETGROUP | LOGIN_SETPATH | 2809 LOGIN_SETENV)); 2810 #endif 2811 ftpd_logwtmp(wtmpid, NULL, NULL); 2812 } 2813 /* beware of flushing buffers after a SIGPIPE */ 2814 _exit(status); 2815 } 2816 2817 static void 2818 sigurg(int signo) 2819 { 2820 2821 recvurg = 1; 2822 } 2823 2824 static void 2825 maskurg(int flag) 2826 { 2827 int oerrno; 2828 sigset_t sset; 2829 2830 if (!transflag) { 2831 syslog(LOG_ERR, "Internal: maskurg() while no transfer"); 2832 return; 2833 } 2834 oerrno = errno; 2835 sigemptyset(&sset); 2836 sigaddset(&sset, SIGURG); 2837 sigprocmask(flag ? SIG_BLOCK : SIG_UNBLOCK, &sset, NULL); 2838 errno = oerrno; 2839 } 2840 2841 static void 2842 flagxfer(int flag) 2843 { 2844 2845 if (flag) { 2846 if (transflag) 2847 syslog(LOG_ERR, "Internal: flagxfer(1): " 2848 "transfer already under way"); 2849 transflag = 1; 2850 maskurg(0); 2851 recvurg = 0; 2852 } else { 2853 if (!transflag) 2854 syslog(LOG_ERR, "Internal: flagxfer(0): " 2855 "no active transfer"); 2856 maskurg(1); 2857 transflag = 0; 2858 } 2859 } 2860 2861 /* 2862 * Returns 0 if OK to resume or -1 if abort requested. 2863 */ 2864 static int 2865 myoob(void) 2866 { 2867 char *cp; 2868 int ret; 2869 2870 if (!transflag) { 2871 syslog(LOG_ERR, "Internal: myoob() while no transfer"); 2872 return (0); 2873 } 2874 cp = tmpline; 2875 ret = get_line(cp, 7, stdin); 2876 if (ret == -1) { 2877 reply(221, "You could at least say goodbye."); 2878 dologout(0); 2879 } else if (ret == -2) { 2880 /* Ignore truncated command. */ 2881 return (0); 2882 } 2883 upper(cp); 2884 if (strcmp(cp, "ABOR\r\n") == 0) { 2885 tmpline[0] = '\0'; 2886 reply(426, "Transfer aborted. Data connection closed."); 2887 reply(226, "Abort successful."); 2888 return (-1); 2889 } 2890 if (strcmp(cp, "STAT\r\n") == 0) { 2891 tmpline[0] = '\0'; 2892 if (file_size != -1) 2893 reply(213, "Status: %jd of %jd bytes transferred.", 2894 (intmax_t)byte_count, (intmax_t)file_size); 2895 else 2896 reply(213, "Status: %jd bytes transferred.", 2897 (intmax_t)byte_count); 2898 } 2899 return (0); 2900 } 2901 2902 /* 2903 * Note: a response of 425 is not mentioned as a possible response to 2904 * the PASV command in RFC959. However, it has been blessed as 2905 * a legitimate response by Jon Postel in a telephone conversation 2906 * with Rick Adams on 25 Jan 89. 2907 */ 2908 void 2909 passive(void) 2910 { 2911 socklen_t len; 2912 int on; 2913 char *p, *a; 2914 2915 if (pdata >= 0) /* close old port if one set */ 2916 close(pdata); 2917 2918 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2919 if (pdata < 0) { 2920 perror_reply(425, "Can't open passive connection"); 2921 return; 2922 } 2923 on = 1; 2924 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 2925 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 2926 2927 (void) seteuid(0); 2928 2929 #ifdef IP_PORTRANGE 2930 if (ctrl_addr.su_family == AF_INET) { 2931 on = restricted_data_ports ? IP_PORTRANGE_HIGH 2932 : IP_PORTRANGE_DEFAULT; 2933 2934 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 2935 &on, sizeof(on)) < 0) 2936 goto pasv_error; 2937 } 2938 #endif 2939 #ifdef IPV6_PORTRANGE 2940 if (ctrl_addr.su_family == AF_INET6) { 2941 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 2942 : IPV6_PORTRANGE_DEFAULT; 2943 2944 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 2945 &on, sizeof(on)) < 0) 2946 goto pasv_error; 2947 } 2948 #endif 2949 2950 pasv_addr = ctrl_addr; 2951 pasv_addr.su_port = 0; 2952 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0) 2953 goto pasv_error; 2954 2955 (void) seteuid(pw->pw_uid); 2956 2957 len = sizeof(pasv_addr); 2958 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2959 goto pasv_error; 2960 if (listen(pdata, 1) < 0) 2961 goto pasv_error; 2962 if (pasv_addr.su_family == AF_INET) 2963 a = (char *) &pasv_addr.su_sin.sin_addr; 2964 else if (pasv_addr.su_family == AF_INET6 && 2965 IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) 2966 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 2967 else 2968 goto pasv_error; 2969 2970 p = (char *) &pasv_addr.su_port; 2971 2972 #define UC(b) (((int) b) & 0xff) 2973 2974 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2975 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2976 return; 2977 2978 pasv_error: 2979 (void) seteuid(pw->pw_uid); 2980 (void) close(pdata); 2981 pdata = -1; 2982 perror_reply(425, "Can't open passive connection"); 2983 return; 2984 } 2985 2986 /* 2987 * Long Passive defined in RFC 1639. 2988 * 228 Entering Long Passive Mode 2989 * (af, hal, h1, h2, h3,..., pal, p1, p2...) 2990 */ 2991 2992 void 2993 long_passive(char *cmd, int pf) 2994 { 2995 socklen_t len; 2996 int on; 2997 char *p, *a; 2998 2999 if (pdata >= 0) /* close old port if one set */ 3000 close(pdata); 3001 3002 if (pf != PF_UNSPEC) { 3003 if (ctrl_addr.su_family != pf) { 3004 switch (ctrl_addr.su_family) { 3005 case AF_INET: 3006 pf = 1; 3007 break; 3008 case AF_INET6: 3009 pf = 2; 3010 break; 3011 default: 3012 pf = 0; 3013 break; 3014 } 3015 /* 3016 * XXX 3017 * only EPRT/EPSV ready clients will understand this 3018 */ 3019 if (strcmp(cmd, "EPSV") == 0 && pf) { 3020 reply(522, "Network protocol mismatch, " 3021 "use (%d)", pf); 3022 } else 3023 reply(501, "Network protocol mismatch."); /*XXX*/ 3024 3025 return; 3026 } 3027 } 3028 3029 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 3030 if (pdata < 0) { 3031 perror_reply(425, "Can't open passive connection"); 3032 return; 3033 } 3034 on = 1; 3035 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0) 3036 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m"); 3037 3038 (void) seteuid(0); 3039 3040 pasv_addr = ctrl_addr; 3041 pasv_addr.su_port = 0; 3042 len = pasv_addr.su_len; 3043 3044 #ifdef IP_PORTRANGE 3045 if (ctrl_addr.su_family == AF_INET) { 3046 on = restricted_data_ports ? IP_PORTRANGE_HIGH 3047 : IP_PORTRANGE_DEFAULT; 3048 3049 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, 3050 &on, sizeof(on)) < 0) 3051 goto pasv_error; 3052 } 3053 #endif 3054 #ifdef IPV6_PORTRANGE 3055 if (ctrl_addr.su_family == AF_INET6) { 3056 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH 3057 : IPV6_PORTRANGE_DEFAULT; 3058 3059 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, 3060 &on, sizeof(on)) < 0) 3061 goto pasv_error; 3062 } 3063 #endif 3064 3065 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0) 3066 goto pasv_error; 3067 3068 (void) seteuid(pw->pw_uid); 3069 3070 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 3071 goto pasv_error; 3072 if (listen(pdata, 1) < 0) 3073 goto pasv_error; 3074 3075 #define UC(b) (((int) b) & 0xff) 3076 3077 if (strcmp(cmd, "LPSV") == 0) { 3078 p = (char *)&pasv_addr.su_port; 3079 switch (pasv_addr.su_family) { 3080 case AF_INET: 3081 a = (char *) &pasv_addr.su_sin.sin_addr; 3082 v4_reply: 3083 reply(228, 3084 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 3085 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3086 2, UC(p[0]), UC(p[1])); 3087 return; 3088 case AF_INET6: 3089 if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) { 3090 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; 3091 goto v4_reply; 3092 } 3093 a = (char *) &pasv_addr.su_sin6.sin6_addr; 3094 reply(228, 3095 "Entering Long Passive Mode " 3096 "(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)", 3097 6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 3098 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 3099 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 3100 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 3101 2, UC(p[0]), UC(p[1])); 3102 return; 3103 } 3104 } else if (strcmp(cmd, "EPSV") == 0) { 3105 switch (pasv_addr.su_family) { 3106 case AF_INET: 3107 case AF_INET6: 3108 reply(229, "Entering Extended Passive Mode (|||%d|)", 3109 ntohs(pasv_addr.su_port)); 3110 return; 3111 } 3112 } else { 3113 /* more proper error code? */ 3114 } 3115 3116 pasv_error: 3117 (void) seteuid(pw->pw_uid); 3118 (void) close(pdata); 3119 pdata = -1; 3120 perror_reply(425, "Can't open passive connection"); 3121 return; 3122 } 3123 3124 /* 3125 * Generate unique name for file with basename "local" 3126 * and open the file in order to avoid possible races. 3127 * Try "local" first, then "local.1", "local.2" etc, up to "local.99". 3128 * Return descriptor to the file, set "name" to its name. 3129 * 3130 * Generates failure reply on error. 3131 */ 3132 static int 3133 guniquefd(char *local, char **name) 3134 { 3135 static char new[MAXPATHLEN]; 3136 struct stat st; 3137 char *cp; 3138 int count; 3139 int fd; 3140 3141 cp = strrchr(local, '/'); 3142 if (cp) 3143 *cp = '\0'; 3144 if (stat(cp ? local : ".", &st) < 0) { 3145 perror_reply(553, cp ? local : "."); 3146 return (-1); 3147 } 3148 if (cp) { 3149 /* 3150 * Let not overwrite dirname with counter suffix. 3151 * -4 is for /nn\0 3152 * In this extreme case dot won't be put in front of suffix. 3153 */ 3154 if (strlen(local) > sizeof(new) - 4) { 3155 reply(553, "Pathname too long."); 3156 return (-1); 3157 } 3158 *cp = '/'; 3159 } 3160 /* -4 is for the .nn<null> we put on the end below */ 3161 (void) snprintf(new, sizeof(new) - 4, "%s", local); 3162 cp = new + strlen(new); 3163 /* 3164 * Don't generate dotfile unless requested explicitly. 3165 * This covers the case when basename gets truncated off 3166 * by buffer size. 3167 */ 3168 if (cp > new && cp[-1] != '/') 3169 *cp++ = '.'; 3170 for (count = 0; count < 100; count++) { 3171 /* At count 0 try unmodified name */ 3172 if (count) 3173 (void)sprintf(cp, "%d", count); 3174 if ((fd = open(count ? new : local, 3175 O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) { 3176 *name = count ? new : local; 3177 return (fd); 3178 } 3179 if (errno != EEXIST) { 3180 perror_reply(553, count ? new : local); 3181 return (-1); 3182 } 3183 } 3184 reply(452, "Unique file name cannot be created."); 3185 return (-1); 3186 } 3187 3188 /* 3189 * Format and send reply containing system error number. 3190 */ 3191 void 3192 perror_reply(int code, char *string) 3193 { 3194 3195 reply(code, "%s: %s.", string, strerror(errno)); 3196 } 3197 3198 static char *onefile[] = { 3199 "", 3200 0 3201 }; 3202 3203 void 3204 send_file_list(char *whichf) 3205 { 3206 struct stat st; 3207 DIR *dirp = NULL; 3208 struct dirent *dir; 3209 FILE *dout = NULL; 3210 char **dirlist, *dirname; 3211 int simple = 0; 3212 int freeglob = 0; 3213 glob_t gl; 3214 3215 if (strpbrk(whichf, "~{[*?") != NULL) { 3216 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 3217 3218 memset(&gl, 0, sizeof(gl)); 3219 gl.gl_matchc = MAXGLOBARGS; 3220 flags |= GLOB_LIMIT; 3221 freeglob = 1; 3222 if (glob(whichf, flags, 0, &gl)) { 3223 reply(550, "No matching files found."); 3224 goto out; 3225 } else if (gl.gl_pathc == 0) { 3226 errno = ENOENT; 3227 perror_reply(550, whichf); 3228 goto out; 3229 } 3230 dirlist = gl.gl_pathv; 3231 } else { 3232 onefile[0] = whichf; 3233 dirlist = onefile; 3234 simple = 1; 3235 } 3236 3237 while ((dirname = *dirlist++)) { 3238 if (stat(dirname, &st) < 0) { 3239 /* 3240 * If user typed "ls -l", etc, and the client 3241 * used NLST, do what the user meant. 3242 */ 3243 if (dirname[0] == '-' && *dirlist == NULL && 3244 dout == NULL) 3245 retrieve(_PATH_LS " %s", dirname); 3246 else 3247 perror_reply(550, whichf); 3248 goto out; 3249 } 3250 3251 if (S_ISREG(st.st_mode)) { 3252 if (dout == NULL) { 3253 dout = dataconn("file list", -1, "w"); 3254 if (dout == NULL) 3255 goto out; 3256 STARTXFER; 3257 } 3258 START_UNSAFE; 3259 fprintf(dout, "%s%s\n", dirname, 3260 type == TYPE_A ? "\r" : ""); 3261 END_UNSAFE; 3262 if (ferror(dout)) 3263 goto data_err; 3264 byte_count += strlen(dirname) + 3265 (type == TYPE_A ? 2 : 1); 3266 CHECKOOB(goto abrt); 3267 continue; 3268 } else if (!S_ISDIR(st.st_mode)) 3269 continue; 3270 3271 if ((dirp = opendir(dirname)) == NULL) 3272 continue; 3273 3274 while ((dir = readdir(dirp)) != NULL) { 3275 char nbuf[MAXPATHLEN]; 3276 3277 CHECKOOB(goto abrt); 3278 3279 #if (defined(__BEOS__) || defined(__HAIKU__)) 3280 if (dir->d_name[0] == '.' && dir->d_name[1] == '\0') 3281 continue; 3282 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 3283 dir->d_name[2] == '\0') 3284 continue; 3285 #else 3286 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 3287 continue; 3288 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 3289 dir->d_namlen == 2) 3290 continue; 3291 #endif 3292 3293 snprintf(nbuf, sizeof(nbuf), 3294 "%s/%s", dirname, dir->d_name); 3295 3296 /* 3297 * We have to do a stat to insure it's 3298 * not a directory or special file. 3299 */ 3300 if (simple || (stat(nbuf, &st) == 0 && 3301 S_ISREG(st.st_mode))) { 3302 if (dout == NULL) { 3303 dout = dataconn("file list", -1, "w"); 3304 if (dout == NULL) 3305 goto out; 3306 STARTXFER; 3307 } 3308 START_UNSAFE; 3309 if (nbuf[0] == '.' && nbuf[1] == '/') 3310 fprintf(dout, "%s%s\n", &nbuf[2], 3311 type == TYPE_A ? "\r" : ""); 3312 else 3313 fprintf(dout, "%s%s\n", nbuf, 3314 type == TYPE_A ? "\r" : ""); 3315 END_UNSAFE; 3316 if (ferror(dout)) 3317 goto data_err; 3318 byte_count += strlen(nbuf) + 3319 (type == TYPE_A ? 2 : 1); 3320 CHECKOOB(goto abrt); 3321 } 3322 } 3323 (void) closedir(dirp); 3324 dirp = NULL; 3325 } 3326 3327 if (dout == NULL) 3328 reply(550, "No files found."); 3329 else if (ferror(dout)) 3330 data_err: perror_reply(550, "Data connection"); 3331 else 3332 reply(226, "Transfer complete."); 3333 out: 3334 if (dout) { 3335 ENDXFER; 3336 abrt: 3337 (void) fclose(dout); 3338 data = -1; 3339 pdata = -1; 3340 } 3341 if (dirp) 3342 (void) closedir(dirp); 3343 if (freeglob) { 3344 freeglob = 0; 3345 globfree(&gl); 3346 } 3347 } 3348 3349 void 3350 reapchild(int signo) 3351 { 3352 while (waitpid(-1, NULL, WNOHANG) > 0); 3353 } 3354 3355 static void 3356 appendf(char **strp, char *fmt, ...) 3357 { 3358 va_list ap; 3359 char *ostr, *p; 3360 3361 va_start(ap, fmt); 3362 vasprintf(&p, fmt, ap); 3363 va_end(ap); 3364 if (p == NULL) 3365 fatalerror("Ran out of memory."); 3366 if (*strp == NULL) 3367 *strp = p; 3368 else { 3369 ostr = *strp; 3370 asprintf(strp, "%s%s", ostr, p); 3371 if (*strp == NULL) 3372 fatalerror("Ran out of memory."); 3373 free(ostr); 3374 } 3375 } 3376 3377 static void 3378 logcmd(char *cmd, char *file1, char *file2, off_t cnt) 3379 { 3380 char *msg = NULL; 3381 char wd[MAXPATHLEN + 1]; 3382 3383 if (logging <= 1) 3384 return; 3385 3386 if (getcwd(wd, sizeof(wd) - 1) == NULL) 3387 strcpy(wd, strerror(errno)); 3388 3389 appendf(&msg, "%s", cmd); 3390 if (file1) 3391 appendf(&msg, " %s", file1); 3392 if (file2) 3393 appendf(&msg, " %s", file2); 3394 if (cnt >= 0) 3395 appendf(&msg, " = %jd bytes", (intmax_t)cnt); 3396 appendf(&msg, " (wd: %s", wd); 3397 if (guest || dochroot) 3398 appendf(&msg, "; chrooted"); 3399 appendf(&msg, ")"); 3400 syslog(LOG_INFO, "%s", msg); 3401 free(msg); 3402 } 3403 3404 static void 3405 logxfer(char *name, off_t size, time_t start) 3406 { 3407 char buf[MAXPATHLEN + 1024]; 3408 char path[MAXPATHLEN + 1]; 3409 time_t now; 3410 3411 if (statfd >= 0) { 3412 time(&now); 3413 if (realpath(name, path) == NULL) { 3414 syslog(LOG_NOTICE, "realpath failed on %s: %m", path); 3415 return; 3416 } 3417 snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s!%jd!%ld\n", 3418 ctime(&now)+4, ident, remotehost, 3419 path, (intmax_t)size, 3420 (long)(now - start + (now == start))); 3421 write(statfd, buf, strlen(buf)); 3422 } 3423 } 3424 3425 static char * 3426 doublequote(char *s) 3427 { 3428 int n; 3429 char *p, *s2; 3430 3431 for (p = s, n = 0; *p; p++) 3432 if (*p == '"') 3433 n++; 3434 3435 if ((s2 = malloc(p - s + n + 1)) == NULL) 3436 return (NULL); 3437 3438 for (p = s2; *s; s++, p++) { 3439 if ((*p = *s) == '"') 3440 *(++p) = '"'; 3441 } 3442 *p = '\0'; 3443 3444 return (s2); 3445 } 3446 3447 /* setup server socket for specified address family */ 3448 /* if af is PF_UNSPEC more than one socket may be returned */ 3449 /* the returned list is dynamically allocated, so caller needs to free it */ 3450 static int * 3451 socksetup(int af, char *bindname, const char *bindport) 3452 { 3453 struct addrinfo hints, *res, *r; 3454 int error, maxs, *s, *socks; 3455 const int on = 1; 3456 3457 memset(&hints, 0, sizeof(hints)); 3458 hints.ai_flags = AI_PASSIVE; 3459 hints.ai_family = af; 3460 hints.ai_socktype = SOCK_STREAM; 3461 error = getaddrinfo(bindname, bindport, &hints, &res); 3462 if (error) { 3463 syslog(LOG_ERR, "%s", gai_strerror(error)); 3464 if (error == EAI_SYSTEM) 3465 syslog(LOG_ERR, "%s", strerror(errno)); 3466 return NULL; 3467 } 3468 3469 /* Count max number of sockets we may open */ 3470 for (maxs = 0, r = res; r; r = r->ai_next, maxs++) 3471 ; 3472 socks = malloc((maxs + 1) * sizeof(int)); 3473 if (!socks) { 3474 freeaddrinfo(res); 3475 syslog(LOG_ERR, "couldn't allocate memory for sockets"); 3476 return NULL; 3477 } 3478 3479 *socks = 0; /* num of sockets counter at start of array */ 3480 s = socks + 1; 3481 for (r = res; r; r = r->ai_next) { 3482 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 3483 if (*s < 0) { 3484 syslog(LOG_DEBUG, "control socket: %m"); 3485 continue; 3486 } 3487 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 3488 &on, sizeof(on)) < 0) 3489 syslog(LOG_WARNING, 3490 "control setsockopt (SO_REUSEADDR): %m"); 3491 if (r->ai_family == AF_INET6) { 3492 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 3493 &on, sizeof(on)) < 0) 3494 syslog(LOG_WARNING, 3495 "control setsockopt (IPV6_V6ONLY): %m"); 3496 } 3497 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 3498 syslog(LOG_DEBUG, "control bind: %m"); 3499 close(*s); 3500 continue; 3501 } 3502 (*socks)++; 3503 s++; 3504 } 3505 3506 if (res) 3507 freeaddrinfo(res); 3508 3509 if (*socks == 0) { 3510 syslog(LOG_ERR, "control socket: Couldn't bind to any socket"); 3511 free(socks); 3512 return NULL; 3513 } 3514 return(socks); 3515 } 3516